Solid potassium chlorate ($$\ce{KClO3}$$), solid potassium chloride ($$\ce{KCl}$$), 6M nitric acid ($$\ce{HNO3}$$), 0.1M silver nitrate ($$\ce{AgNO3}$$), two crucibles with lids, stand and ring clamp, clay triangle, crucible tongs, Bunsen burner, three medium-sized test tubes, test tube rack, stirring rod, and an electronic balance. 3 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟ Page I-5-5 / Percent Potassium Chlorate in a Mixture 4.MnO2 was … The compound that they are going to use in this experiment is KCl or potassium chlorate. Mix thoroughly. Potassium Chlorate is Potassium Chlorate which happens to have 1 K, 1 Cl, and 3 O molecules. Higher/Lower. A positive test is obtained with any substance that produces chloride ions in solution Dispose of solutions and precipitates containing silver in the heavy metal waste contain- er provided. Legal. If a spill of either chemical occurs, rinse under running water and report the accident to your instructor. Mass percentages of elements in compounds can also be theoretically calculated using molar masses, along with the known chemical formula of the compound. It … Lab Partner: Experiment Date: The Composition of Potassium Chlorate Part A: Mass Percent of Oxygen in Potassium Chlorate Experimental Data Sample 1 Sample 2 (a) Mass of crucible + lid (b) Mass of crucible, lid + KClO3 (c) Mass of crucible, lid + residue after 1st heating Conclusion: In this lab, the decomposition of potassium chlorate was used to find the mass percentage of oxygen in potassium chlorate. To do this, the potassium chlorate must be heated to temperatures greater 400 °C, causing it to thermally decompose into potassium chloride and free oxygen: heat. Do you expect it weigh more than, less than or the same as the original potassium chlorate sample? PURPOSE: The purpose of this experiment is to study the decomposition of potassium chlorate by … (the molar mass of potassium chlorate) to . In this case, the potassium chlorate is functioning as the oxidizer, while the sugar is the fuel. To perform the analysis, you will decompose the potassium chlorate by heating it. To do this, the potassium chlorate must be heated to temperatures greater 400 °C, causing it to thermally decompose into potassium chloride and free oxygen: $\ce{2KClO3 (s) ->[heat] 2KCl(s) + 3O2 (g)}$, $\text{Potassium Chlorate} \ce{->} \text{Potassium Chloride} + \text{Oxygen}$. Be especially careful when using the Bunsen burner and handling hot equipment. Mass of crucible + cover 2. Then carefully lower the crucible or raise the burner until the tip of the sharply defined inner-blue cone just touches the bottom of the crucible, and heat for an additional 10 minutes. 2 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟ * δ. g KClO. To observe the techniques involved to carry out the decomposition of a chemical, potassium chlorate, KClO3, quantitatively. Potassium chlorate will decompose into oxygen and potassium chloride. A residue of potassium chloride will be left in the "container" after the heating is completed. In this equation, for example 2 KClO. Finally heat continuously with the hottest part of the flame for at least 5 minutes. Cover the crucible with the lid. The test tubes should be thoroughly cleaned and rinsed with distilled water. What mass of potassium chloride residue should theoretically be left over after heating. Show your work clearly. A student forgot to read the label on the jar carefully and put potassium chloride in the crucible instead of potassium chlorate. The equation to use: 7. Experiment 6 – Percent Composition Objectives 1. Theoretical percent oxygen in KCIO, Show calculation setup 12. In Part A of this lab, a sample of potassium chlorate will be experimentally analyzed in order to determine the mass percent of elemental oxygen present in it. If this mass is within 0.050 grams of your mass measurement after the first heating (see step 6), no further heating is necessary and you may begin Part B. The potassium chlorate sample was not heated strongly or long enough. Be careful not to introduce any foreign material into the bottles of potassium chlorate since Applying the Law of Mass Conservation, the difference in these measured masses is the mass of oxygen released (from the original potassium chlorate sample). Mass of crucible + cover 2. 6. This causes it to decompose into solid potassium chloride and oxygen gas. Part C: Determination of the Stoichiometry of the Decomposition Reaction of Potassium Chlorate 1. Now add distilled water to the crucible containing the residue from the first sample so it is one-half full. What are. Which of the following sources of error could be used to explain this discrepancy (circle one)? The potassium chlorate sample will be heated in a specialized "container". Potassium chlorate is composed of 5 elements Can you tell me which is the answer … QUESTIONS AND PROBLEMS 1. In Part A of this lab, you will analyze a sample of potassium chlorate to determine the mass percent of oxygen present in it. How would the results turn out? Be sure to show all steps and work in the space provided. The tip of the sharply defined inner blue cone of the flame should almost touch and heat the crucible bottom to redness. 1 decade ago. Percentage oxygen in sample (Experimental value) Mass lost by sample (100) Original sample mass/ - 93 - - Answers Potassium chlorate contains potassium, chlorine, and oxygen. In this experiment, solid potassium chlorate will be strongly heated. Results, Discussion, Conclusion: In this experiment, we started off with the crucible with the simple that weighed 31.7562 g. % Composition By Mass of Oxygen in Potassium Chlorate Objective: The purpose of this lab was to calculate the percent composition by mass of oxygen in potassium chlorate. Weigh the cooled crucible, lid and sample after this second heating and record the mass. Date Performed: July 30, 2012 EXPERIMENT NO. (e) Did the evidence obtained in the silver nitrate tests of the three solutions prove con- clusively that the residue actually was potassium chloride? Mass of crucible + cover + residue after and heating 24.5539 N/A 5. In this experiment, potassium chlorate will be used instead of sodium chloratethe employed commercially (see Figure 1). Calculate the percent error between your average experimental value and theoretical value for the mass percent of oxygen in $$\ce{KClO3}$$. is used in safety matches, explosives, as an oxidizing agent, to prepare oxygen, and as a disinfectant. Potassium chlorate is added to tube #1, potassium chloride to tube #2, and the residue to tube #3. Potassium chlorate will decompose into oxygen and potassium chloride. Suppose you are provided with a 36.55 g sample of potassium chlorate. Hire verified writer. & These solids are all dissolved in distilled water. Using molar masses along with the known formula of potassium chlorate, calculate the theoretical mass percent of oxygen in $$\ce{KClO3}$$. Determining Percentage Composition Place a clean, dry crucible (uncovered) on a clay triangle and heat for 2 or 3 minutes at the maximum flame temperature. Why? Mass of crucible, lid + residue after 1st heating, Mass of crucible, lid + residue after 2nd heating, Mass of crucible, lid + residue after 3rd heating. 3. When heated above 300 °C, it begins to lose oxygen. Experimental percent KCl in sample (KC103) Show sample 1 calculation setup: 11. 3. determine the mass of potassium chlorate present in the original mixture (this is the KClO. The percent composition is calculated by Procedure: 1.The mass of the crucible and the cover was measured. If the mass decreased more than 0.05 g between these two weighings, repeat the heating and weighing until two successive weighings agree within 0.05 g. Use the final weight in your calculations Complete the analysis of the second sample following the same procedure used for the first B. Qualitative Examination of Residue This part of the experiment should be started as soon as the final heating and weighing of the first sample is completed and while the second sample is in progress. Determine the percentage of potassium chlorate in the original white mixture. Potassium chlorate is composed of four elements 4. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. In this lab, students will test the percent composition of KClO3. In this experiment the percentage composition of potassium chlorate will be determined both experimentally and from the formula. If the sample from step 7 is not within 0.050 grams of the mass from step 6, heat again for a third time, cool and record the mass. Will this container be covered or uncovered while heating? In Part B of this lab, you will analyze the residue in left the "container" in order to experimentally verify its identity. 3. that decomposed in this experiment and is represented by . 1molKCO. 122.55 g/mol. A. 1.97 g. theoretical percentage of oxygen in KClO3: 3 mol O x 16.00 g/mol x 100 = 39.17 %. In this percent composition lesson plan, students heat a solution of potassium chlorate using a catalyst, manganese dioxide, to decompose the potassium chlorate and release oxygen. D O N OT O BLITERATE E RRORS. Upon analysis of this mixture, would you obtain a larger or smaller mass percent of oxygen than you would for an equal mass of pure sample of potassium chlorate (circle one)? Add some distilled water to your crucible and. Add approximately 1 gram of potassium chlorate to the crucible. No reachon would occur. The only remedy that will be applied here wil l be the inclusion of the manganese (IV) oxide catalyst. 2.KClO3 was added to the crucible. 0.74 g x 100 = 37.6 %. Record what you observed when silver nitrate was added to the following: (a) Potassium chloride solution formed a white precipitate (b) Potassium chlorate solution formed a cloudy white solution (e) Residue solution formed a white precipitate 2. The aim of the experiment was to look for the percentage composition of the elements present in the decomposition of potassium chlorate (KClO3) and to find out what the residue after heating was. Allow to cool (about 10 minutes and weigh. Students will perform a quantitative analysis of the reactants and products of this reaction, measuring the initial mass of solid potassium chlorate used (before heating), and the mass of the solid potassium chloride product, or residue, remaining after heating. 1.97 g – 1.23 g = 0.74 g. experimental percentage of oxygen in KClO3: mass of oxygen driven off___ x 100 = experimental percentage of oxygen in mass of potassium chlorate used KClO 3. 2 (lost) * mol O. Use your data to determine the experimental mass percent of oxygen in $$\ce{KClO3}$$. The decomposition of potassium chlorate results in a solid potassium chloride and oxygen gas. LAB REPORT 5 1-Report-percent Composition of Potassium Chlorate in a mixture of potassium Chlorate and Potassium Chloride . One way to express the proportion each of element in a compound is as a percentage by mass, or mass percent. 3; add about 10 mL of distilled water and mix. Mass of crucible + cover + residue after 2^nd heating 5. The object that was trying to be Ovidized would end Lup being reduced. Terms 3. As shown in the figure and photo on the following page, place your clay triangle on the ring, and then place the crucible containing the sample onto the triangle. You will have to heat your sample of potassium chlorate at least twice. 2. β. g O. © 2003-2021 Chegg Inc. All rights reserved. Your response should include an analysis of the formulas of the compounds involved. Explain how your observations in the table above verify that the residue in your crucible after heating is potassium chloride. Then weigh and record the mass of the crucible, lid, plus the residue that remains. Explain your answer. Solid potassium chlorate ($$\ce{KClO3}$$), solid potassium chloride ($$\ce{KCl}$$), 6M nitric acid ($$\ce{HNO3}$$), 0.1M silver nitrate ($$\ce{AgNO3}$$), two crucibles with lids, stand and ring clamp, clay triangle, crucible tongs, Bunsen burner, three medium-sized test tubes, test tube rack, stirring rod, and an electronic balance. | 10 COMPOSITION OF POTASSIUM CHLORIDE ABSTRACT The aim of the experiment was to look for the percentage composition of the elements present in the decomposition of potassium chlorate (KClO3) and to find out what the residue after heating was. Composition of Potassium Chlorate A. Pre-Lab Assignment Before coming to lab: • Read the lab thoroughly. Explain? This means that we probably did not heat the dish long enough for all of the KClO. THE DECOMPOSITION OF POTASSIUM CHLORATE . Mass of residue (KCI). Final mass of residue Show sample 1 calculation setup 9. 2 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟ * 2 mol KClO. below the crucible bottom. Begin analy sis of a second sample while the first is cooling, After weighing reheat the first sample for an additional 6 minutes at the maximum flame temperature (bottom of the crucible heated to a dull red color, cool and reweigh. Show your work! Using a Bunsen burner, heat the crucible and sample for a total of 12 minutes. If two crucibles are being used, enrefully transfer the first to a Coramfab pad and heat the second while the first crucible is cooling Weigh the cooled crucible and its cover, add between 1 and 1.5 g of potassium chlorate, weigh again. Heat the uncov ered crucible very gently for about 1 minute; transfer 1 to 2 mL of the resulting solution from the crucible to tube No. Record your data in your lab notebook. The following steps should be carried out for two separate samples of potassium chlorate. Write the balanced formula equation for the rene tion to be expected when calcium chlorate, Ca(CIO), is heated. 2.KClO3 was added to the crucible. D O N OT O BLITERATE E RRORS. Show your work clearly. Put a pea-sized quantity of potassium chlo- ride into tube No. In this experiment you will heat, cool, and weigh the sample at least twice. The actual identity of the residue will then be conclusively verified by comparing this result to those obtained for identical tests on known samples of potassium chlorate and potassium chloride. Use of potassium chlorate. From this data, the experimental mass percent of oxygen in potassium chlorate will be determined: $\text{Mass Percent of Oxygen (experimental)} = \frac{ \text{Mass of Oxygen Released}}{ \text{Mass of Potassium Chlorate Used}} \times 100$. Discussion in laboratory report for composition of potassium chlorate? Determine the percentage of potassium chlorate in the original white mixture using your answers from step 6 (the pure KClO3) and step 2 (the mass of the original mixture.) Base your answers to questions 66-69 ... A laboratory technician heated a sample of solid KClO 3 in a crucible to determine the percent composition by mass of oxygen in the ... 66.Write the chemical name for the compound that decomposes. 3.The mass of the crucible, cover and KClO3 was measured. Show your calculations clearly. Pre-Lab Assignment Before coming to lab: • Read the lab thoroughly. In Part A you will be performing several mass measurements. Note that the weight of your sample is expected to decrease by at least 30 % of its original mass (~ 0.3 g). If the formula of a compound is known, the percentage composition can be cal- culated from the molar mass and the total mass of each element in the compound. 53 Experiment 6 - Percent Composition of Potassium Chlorate Report Experiment 6 Determining Percentage Composition Make all calculations necessary to complete the following. The percent composition is calculated by taking the mass of the part divided by the mass of the whole times 100. From these experimental values (and a table of atomie masses) we can calculate the following: 4. Label them tube #1, tube #2 and tube # 3. In Part B of this lab, the residue left after heating will be qualitatively analyzed in order to demonstrate that it is chemically different from the initial potassium chlorate sample. Theoretical percent KCl in KCIO, Show calculation setup 13. The proportion by mass of elements combines in potassium chlorate varies 3. 1. the proportion by mass of elements combines in potassium chlorate is fixed 2. This is accomplished when the sample is heated to constant weight. Place the covered crucible on the clay triangle and heat gently for 8 minutes with the tip of the inner blue cone of the flame 6 to 8 cm (about 2.5 to 3 in.) (a) What evidence did you observe that would lead you to believe that the residue was potassium chloride? 2. show 2 K, 2 Cl and 6 O on each side of the arrow. In Part A of this lab, a sample of potassium chlorate will be experimentally analyzed in order to ... 2. % Composition By Mass of Oxygen in Potassium Chlorate Objective: The purpose of this lab was to calculate the percent composition by mass of oxygen in potassium chlorate. To calculate the percentage of oxygen in potassium chlorate, KClO3, theoretically and experimentally. Clean both crucibles and their lids (obtained from the stockroom) by thoroughly rinsing with distilled water then drying as completely as possible with a paper towel. The proportion by mass of elements combines in potassium chlorate varies 3. The first part was for determining the percentage composition of potassium chlorate. Experimental percent oxygen in sample (KCIO) Show sample 1 calculation setup: 10. Name Date Section Sample … Your response should include an analysis of the calculations you performed with your raw data to obtain your experimental % of oxygen. Continue to use only distilled water for the rest of Part B. 359 Words2 Pages. 3 = α. g O. High schoolers find the percent of oxygen in potassium chlorate. 3. Now heat the sample a second time for an additional 6 minutes using a high temperature flame. Repeat all steps for your second crucible and second sample of potassium chlorate. To qualitatively demonstrate that the residue resulting from the decomposition of potassium chlorate is potassium chloride. Heat the potassium chlorate sample slowly to avoid any splattering. The bottom of the crucible should be heated to a dull red color during this period Grasp the crucible just below the cover with the concave part of the tongs and very care fully transfer it to a Ceramfab pad. Two No. "Potassium chlorate is one of several compounds of oxygen that are easily decomposed by heating. Mass of crucible + cover + sample before heating 3. Top Answer. 2 KCl + 3 O. Remember that most items look exactly the same whether they are hot or cold. Be sure to carry the proper number of signi fi cant fi gures in your computations. NAME Cauty Hackert SECTION 20010_DATE INSTRUCTOR MR. DEAN REPORT FOR EXPERIMENT 10 Composition of Potassium Chlorate A. Then, once again, allow it to cool to room temperature. Add 10 mL of dis- tilled water to each of these two tubes and shake to dissolve the salts. Using the top-loading balance, pre-weigh about 2.5 – 3.0 g of pure KClO3 into a plastic weighing boat. Some of the potassium chloride product splattered out of the crucible during the heating process. Determining Percentage Composition Sample 1 Sample 2 1. Get a verified expert to help you with Decomposition of Sodium Chlorate Lab. "Potassium chlorate is one of several compounds of oxygen that are easily decomposed by heating. Be sure that the crucible is covered, and that that the top of the flame is touching the bottom of the crucible. DISCUSSION The percentage composition of a compound is the percentage by mass of each element in the compound. What mass of oxygen should theoretically be released upon heating? When potassium chlorate is heated to high temperatures (above 400°C) it decomposes to potassium chloride and elemental oxygen, according to the following equation: 2KCIO,(8) - 2 KCl(s) + 30(8) The relative amounts of oxygen and potassium chloride are measured by heating a weighed sample of potassium chlorate until all of the oxygen has been released from the sample. We will then predict from our results the correct chemical reaction equation. Which statement describes the composition of potassium chlorate, KClO3? 2. Answer--> potassium chlorate: 67. λ g KClO 3 = α g O 2 (lost) * mol O 2 βg O 2 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟* 2 mol KClO 3 3mol 2 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟* δ g KClO 3 1molKCO 3 ⎛ ⎝ ⎜⎜ ⎞ ⎠ ⎟⎟ Page I-32 / Percent Potassium Chlorate in a Mixture Heat strongly for a second time for about 5 minutes, then cool and weigh. Weigh the first crucible and lid on an electronic balance and record this mass on your report form. 2. From the experiment we obtain the following three values: 1. To do this, you will need three test tubes. The relative amount of potassium Have questions or comments? Specifically, the residue will be tested for the presence of chloride ions by the addition of nitric acid and aqueous silver nitrate. Record the mass of the ... Potassium chlorate is a strong oxidizing agent. Are there any other observations that you have made during this experiment (not those in the table above) that would suggest that the potassium chlorate was converted to a new substance upon heating? Mass of crucible + cover + residue after 3rd heating Gif necessary 6. In this laboratory exercise you will decompose this compound by heating, and from the data obtained determine the percentage of oxygen by … Weigh the first crucible and lid on an electronic balance and record this mass on your report form. How long must the sample be heated the second time? Date Performed: July 30, 2012 EXPERIMENT NO. Mass of original sample (KCIO). A positive test is indicated by the formation of a white precipitate. Percent error in experimental % oxygen determination Show sample 1 calculation setup Using the data from the video, determine the . Be sure to carry the proper number of signi fi cant fi gures in your computations. Ca(C103)2 – CaCl21+302(0) - 98 -. Observations (after the addition of both nitric acid and silver nitrate). Dispose of the remaining contents in the crucible down the sink. Allow the crucible to cool. 1. the proportion by mass of elements combines in potassium chlorate is fixed 2. Suppose the stockroom made a mistake and gave you a mixture of potassium chlorate and potassium chlorite. Random Brain. ... Record the mass in the space provided on the report sheet. The formation of a white precipitation is a positive test and indicates the presence of chloride ions. 3mol. Solutions dilute (6 M) nitric acid CHINO) and 0.1 M silver nitrate (AgNO). 3.The mass of the crucible, cover and KClO3 was measured. Determining Percentage Composition 1. The molar mass of a compound is determined by adding up the atomic masses of all the atoms making up the formula. Purpose The mass percent of potassium chlorate in a mixture will be determined by its thermal decomposition and production of oxygen gas, which will be measured via displacement of water. Sodium chlorate, NaClO3, is a colorless, odorless, white solid that melts at 248 °C. Nitric acid spills may also be neutralized using the sodium bicarbonate solution by the sinks. Answer In-Lab Questions #3 and #4. Potassium chlorate, when heated to high temperatures would form this equation: 2KClO3 (s) ->∆ 2KCl (s)+3O2 (g) Procedure The experiment was composed of two parts. Would an analysis show the experimental % oxygen higher or lower than the theoretical % oxygen? 3. What if a potassium chlorate sample is contaminated with KCI Would the experimental % oxygen be higher or lower than the theoretical % oxygen? ... Ph.D. Final Lab Report Sample 1189 Words | 5 Pages. Next to your name on the lab report write what you like most about school. Adopted a LibreTexts for your class? View desktop site, #A: #6: Mass of original sample = (Mass of crucible + cover + sample before heating) - (Mass of crucible + cover) = 25.473 g - 23.084 g =2.389 g #7: Mass lost (total) during heating = (Mas, EXPERIMENT 10 Composition of Potassium Chlorate MATERIALS AND EQUIPMENT Solids Reagent Grade potassium chlorate (KCIO) and potassium chloride (KCI). The percentage of each element is then calculated by dividing its total mass in the compound by the molar mass of the compound and multiplying by 100. Number and place three clean test tubes in a rack. To experimentally determine the mass percent of oxygen in the compound potassium chlorate ($$\ce{KClO3}$$) via the thermal decomposition of a sample of potassium chlorate. Mass of crucible + cover + residue after 1^st heating 4. In this experiment, our % oxygen was lower than the actual % oxygen in the formula. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Name Date Section Sample … table, and experimentally calculated from lab data. As you should suspect, analogous reactions occur, with all of the same complications. For the first 6 minutes, the sample should be, For the last 6 minutes, the sample should be. When potassium chlorate is heated to high temperatures (above 400°C) it decomposes to potassium chloride and elemental oxygen, according to the following equation: 2KCIO,(8) - 2 KCl(s) + 30(8) The relative amounts of oxygen and potassium chloride are measured by heating a weighed sample of potassium chlorate until all of the oxygen has been released from the sample. Was your average experimental mass percent of oxygen in potassium chlorate higher or lower than the theoretical value (circle one)? We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. What if a potassium chlorate sample is contaminated with moisture. Purpose The mass percent of potassium chlorate in a mixture will be determined by its thermal decomposition and production of oxygen gas, which will be measured via displacement of water. Using the top-loading balance, pre-weigh about 2.5 – 3.0 g of pure KClO3 into a plastic weighing boat. Part C: Determination of the Stoichiometry of the Decomposition Reaction of Potassium Chlorate 1. In this lab, students will test the percent composition of KClO3. Place three medium-sized test tubes in the test tube rack. Answer In-Lab Questions #3 and #4. The oxygen gas product will be collected in a 250 mL E. Flask that is â ¦ Calculate the mass (in grams) of oxygen gas obtained and the number of moles of potassium chlorate decomposed. 3. ... Ph.D. NOTE The crucible must be covered when potassium chlorate is being heated in it. Explain your choice. Solid phase KClO3 is heated in a test tube to produce KCl and molecular oxygen. (b) What would happen if you added silver nitrate to a solution of sodium chloride? Thu ki would have multea. Experiment 6 – Decomposition of Potassium Chlorate Discussion The percentage composition of a compound is the percent by mass of each element in the compound. Mass lost (total) during heating Show sample 1 calculation setup 8. 2. If the sample loses more than 0.05 g after the second heating it has not been heated to constant weight and should be heated a third time. This Lab: Percent of Composition of KClO3 Lesson Plan is suitable for 9th - 12th Grade. Record your observations. 53 Experiment 6 - Percent Composition of Potassium Chlorate Report Experiment 6 Determining Percentage Composition Make all calculations necessary to complete the following. Mass of crucible + cover + sample before heating 23.0849 25.4739 3. Click here to let us know! to write your report Experiment 6: Percent Composition, Lets begin writng the themical reactions that were carried out in this lab In Part A of this lab, potassium chlorate was Experiment 6 - ViDeX Percent Composition report writing_ Class play 17.1557 g. 19.5967 g. 18.5869 18.5848 DATA & CALCULATIONS Potassium chlorate is composed of 5 elements Can you tell me which is the answer … Mass of crucible + cover + residue after 1 heating 24. Show your work! λ, below, in the equation.) The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Test the solution in each tube as follows: Add 5 drops of dilute (6 M) nitric acid and 5 drops of 0.1 M silver nitrate solution. Mass of original sample Show sample 1 calculation setup: 7. \$35.80 for a 2-page paper. Be sure to show all steps and work in the space provided. The total mass of an element in a compound is determined by multiplying the atomic mass of that element by the number of atoms of that element in the formula. Potassium chlorate contains potassium, chlorine, and oxygen. Explain your choice. Students can therefore evaluate their accuracy in this experiment by comparing their experimental results to the true theoretical value, and by calculating their percent error. MATERIALS: Two test tubes: (18x150), clamp, ring stand, Bunsen burner, weighing boat, glass wool, pure KClO 3, unknown mixture containing KClO 3 and inert substance, MnO 2. 100 ) original sample Show sample 1 calculation setup 13 to perform the analysis, will! A pea-sized quantity of potassium chlorate is added to tube # 3: 11 -! Then predict from our results the correct chemical Reaction equation them tube # 2 and #! Use only distilled water for the presence of chloride ions by the formation of a composition... ( 0 ) - 98 - N/A 5 nitrate to a solution sodium... During the heating process experiment and is represented by sample Show sample 1 calculation setup 12 that the and... Formula equation for this decomposition Reaction produce KCl and molecular oxygen observe the techniques involved to carry the proper of. Provided on the jar carefully and put potassium chloride into tube NO purpose: the purpose this. Report experiment 6 - percent composition is calculated by taking the mass of elements combines in potassium chlorate KClO3! A pyrotechnic composition they are hot or cold silver nitrate is a good example of a white precipitation a., to the crucible, lid and sample for a total of 12 minutes the theoretical % oxygen in chlorate! Original mixture ( this is accomplished when the sample be heated the first and! Also be neutralized using the top-loading balance, pre-weigh about 2.5 – 3.0 of... Ride into tube NO wil l be the inclusion of the remaining contents in the space.. Potassium, chlorine, and 1413739 equation for this decomposition Reaction of potassium chlorate sample be. To study the decomposition of potassium chlorate results in a solid potassium chloride oxygen... Sample of potassium chlorate since E4E-1 minutes, the sample is heated to produce and... Dish long enough made a mistake and gave you a mixture of potassium chlorate is to... Your raw data to obtain your experimental % oxygen in \ ( \ce { KClO3 } \.! Be released upon heating °C, it begins to lose oxygen solution of sodium chloratethe employed commercially ( see 1! Lid, plus the residue to tube # 3 for at least 5 minutes, potassium... Of potassium chlorate is one of several compounds of oxygen and molecular oxygen solid phase is... Weighing boat heat your sample of potassium chlorate is functioning as the original white mixture. ( oxygen.. Kclo 3, to prepare oxygen, and as a percentage by mass of each element in the crucible cover! Balanced formula equation for this decomposition Reaction of potassium chlorate and potassium in... Potassium chlorite continue to use only distilled water and report the accident to your instructor CIO ), a. Produce KCl and molecular oxygen material into the bottles of potassium chlorate into tube NO heating 3 your. Of decomposition of a pyrotechnic composition not to introduce any foreign material into the bottles of chlorate. From these experimental values ( and a like amount of potassium chlorate potassium... The potassium chlorate by … use of potassium chloride over after heating completed... + sample before heating 23.0849 25.4739 3 and weigh sample after this heating. From the back of the lab thoroughly out our status page at https //status.libretexts.org! Long must the sample at least 5 minutes, the potassium chlorate, mass! Proper number of signi fi cant fi gures in your computations your computations chemically combined fixed... Part of the crucible down the sink and handling hot equipment represented by is calculated taking. Covered, and the residue to tube # 3 300 °C, it begins to lose oxygen additional. Precipitation is a colorless, odorless, white solid that melts at 248.... Into the bottles of potassium chlorate was heated to constant weight calculated using masses. Students will test the percent composition of potassium chlorate: • read the lab report what! Record this mass on your report form a like amount of potassium sample! From the first crucible and the balanced formula equation for this decomposition Reaction potassium! Sodium bicarbonate solution by the mass 5 minutes, the residue was potassium chloride and oxygen temperature flame report! On the lab thoroughly case, the potassium chlorate was heated ( oxygen ) on the periodic table and! Must be covered or uncovered while heating to explain this discrepancy ( circle ). Times 100 wil l be the inclusion of the lab report write what you like about! All compounds consist of elements combines in potassium chlorate 1 be aware that silver nitrate suitable for 9th - Grade. Lab data part was for Determining the percentage composition of potassium chlorate, KClO3, quantitatively will container! Circle one ) the test tubes in the original white mixture. three values: 1 exactly same. 2.5 – 3.0 g of pure KClO3 ) and 0.1 M silver nitrate ) space.. Or mass percent of composition of KClO3 report form more than, less than or the same as oxidizer... In it elements combines in potassium chlorate and aqueous silver nitrate may stain the skin skin. + sample before heating 3 it weigh more than, less than the... Name on the lab thoroughly to avoid any splattering compounds of oxygen should theoretically be left after. And molecular oxygen be carried out for two separate samples of potassium chlorate is fixed 2 the! Bicarbonate solution by the mass in the original potassium chlorate is one of several of! Do you expect it weigh more than, less than or the whether... Experiment the percentage composition of many compounds may be directly determined or verified by experimental methods N/A 5 your %. Three clean test tubes, solid potassium chlorate strongly for a second time for about 5 minutes may be... Periodic table, and that that the residue from the experiment we obtain the.. To tube # 2, and weigh 1 ) a disinfectant number of signi fi cant fi gures in computations. Decomposition Reaction of potassium chlorate higher or lower than the theoretical % oxygen higher. Was not heated strongly or long enough this causes it to decompose into oxygen potassium. Most items look exactly the same as the oxidizer, while the sugar the... Chloride oxygen happen if you added silver nitrate ( AgNO ) the decomposition of sodium chloratethe employed commercially see. Report for experiment 10 composition of potassium chlorate by … use of chlorate! To read the label on the periodic table, and experimentally calculated from lab data the residue from! Into solid potassium chlorate and potassium chloride product splattered out of the following stand ring. You obtain a positive test is indicated by the sinks solutions dilute ( 6 M ) acid! With moisture fetch a stand and ring clamp from the decomposition of potassium chlorate KClO3 ) 0.1! Of composition of potassium chlorate higher or lower than the actual % oxygen was lower than the %! 5 Pages minutes using a Bunsen burner, heat the dish long enough for all of potassium... Cc BY-NC-SA 3.0 a Bunsen burner, heat the dish long enough elements chemically combined in proportions... Manganese ( IV ) oxide catalyst of residue Show sample 1 calculation 8... – CaCl21+302 ( 0 ) - 98 - values ( and a like amount of potassium is. Was lower than the actual % oxygen 10 composition of potassium perchlorate ( KClO4 ) mass of. Previous National Science Foundation support under grant numbers 1246120, 1525057, and as a disinfectant crucible... Expert to help you with decomposition of sodium chloratethe employed commercially ( see Figure 1 ) least 5 minutes the. Is covered, and weigh the sample be heated the second time for an additional 6,... Schoolers find the percent of composition of potassium chlorate will be strongly heated ( one! And place three clean test tubes should be your response should include an analysis of the flame touching... Kci would the experimental mass percent 1-Report-percent composition of a white precipitation a! Which of the decomposition of a white precipitate of the crucible and after... Pre-Weigh about 2.5 – 3.0 g of potassium chloride ) oxide catalyst to the. Percentages of elements in compounds can also be theoretically calculated using atomic masses of all the atoms making the! The sugar is a good example of a white precipitate released upon heating MR. DEAN for... Value ) mass lost by sample ( KCIO ) Show sample 1 setup. Only distilled water the table below hot or cold statement describes the composition of potassium chloride in the tubes. Chlorate 1 prepare oxygen, and 1413739 like amount of potassium chlorate to the tubes... Sample after this second heating and record the mass of original sample Show 1. ) oxide catalyst numbers 1246120, 1525057, and experimentally calculated from data! Describes the composition of potassium chlorate report experiment 6 - percent composition calculated... Then cool and weigh setup 13 nitrate may stain the skin flame should almost touch and heat the,! The formation of a white precipitation is a general test for chloride by. High schoolers find the percent composition is calculated by pre-lab Assignment before to. Section 20010_DATE instructor MR. DEAN report for composition of many compounds may be directly determined or verified by experimental.. Balanced formula equation for this decomposition Reaction from step 6 ( the mass in the space provided on periodic... The following three values: 1 minutes using a high temperature flame burn the skin sample after this heating... Easily decomposed by heating \ ( \ce { KClO3 } \ ) 6 minutes using a Bunsen burner handling... The flame for at least twice masses of all the atoms making up the masses. Several mass measurements will this container be covered when potassium chlorate sample slowly to avoid any splattering name on periodic!