Potassium iodide can block absorption of radioactive iodine by the thyroid gland through flooding the thyroid with non-radioactive iodine and preventing intake of radioactive molecules, thereby protecting the thyroid from cancer causing radiation. % 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. The oxygen gas product will be collected in a 250 mL E. Flask that is … 2. The oxygen will be released into the atmosphere and the remaining KCl can be measured to determine the change in mass. The potassium chlorate was heated to produce potassium chloride and oxygen. Procedure: The procedure used is in the lab manual under Experiment #2, Decomposition of KClO 3. Decomposition of potassium chlorate:When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. It is the most common chlorate in industrial use. Careful mass measurements and physical and/or chemical tests allow one to deduce the proper reaction. 3. used in this experiment. Part C: Determination of the Stoichiometry of the Decomposition Reaction of Potassium Chlorate 1. Consider the title reaction, the thermal decomposition of potassium chlorate. Only when that is understood can one start to consider useful applications of the reaction. It makes use of the coefficient ratio set up by balanced reaction equations to make connections between the reactants and products in reactions. 1 Unit 9 Stoichiometry Notes Stoichiometry is a big word for a process that chemist’s use to calculate amounts in reactions. To determine the original amount of potassium chlorate in a potassium chlorate-potassium chloride mixture by measuring the oxygen lost from decomposition chemicals used potassium chlorate (KClO3) (1 g) potassium chloride (KCl) (71 g) manganese oxide (MnO2) Potassium Iodide is a metal halide composed of potassium and iodide with thyroid protecting and expectorant properties. Using the data from the video, determine the . Procedure: 1.The mass of the crucible and the cover was measured. The pressure of the water vapor at 24°C is 22.4 mmHg. collect the product of oxygen gas over water in a Erlenmeyer Flask. How many moles of KCIO3 are needed to produce 15 moles of oxygen gas? The volume of oxygen collected at 24°C and atmospheric pressure of 762 mmHg is 128 mL. In this lab we will observe the products of decomposition of potassium perchlorate (KClO4). Nothing was altered. Experiment 6 – Decomposition of Potassium Chlorate Discussion The percentage composition of a compound is the percent by mass of each element in the compound. A catalyst, manganese(IV) oxide, is added to the reaction mixture in order to speed up the reaction. When KClO3is heated strongly, it breaks down releasing oxygen gas and leaving behind a thermally stable (i.e., heat-insensitive) solid residue of an ionic potassium compound. Chemistry Chemical Reactions Balancing Chemical Equations. mass of the mixture. This reaction is used for the preparation of oxygen. The reaction is 2 KClO3 -> 2 KCl + 3 O2. Using the top-loading balance, pre-weigh about 2.5 – 3.0 g of pure KClO 3 into a plastic weighing boat. The answer is that reactions are determined by experiment. Introduction: In this lab we will decompose potassium chlorate (KClO 3) and . 3.The mass of the crucible, cover and KClO3 was measured. 1. When KClO and circle final answers. Upon heating, only the potassium chlorate will decompose. 2 KClO 3(s) ® 2 KCl(s) + 3 O 2(g) Eqn. Correct answers: 3 question: The decomposition of potassium chlorate is used as a source of oxygen in the lab. Calculate the mass (in grams) of oxygen gas obtained and the number of moles of potassium chlorate decomposed. Potassium chlorate is a compound containing potassium, chlorine and oxygen, with the molecular formula KClO 3.In its pure form, it is a white crystalline substance. Consider the title reaction, the thermal decomposition of potassium chlorate. If the decomposition is carried out in the presence of manganese dioxide (MnO 2), it … Write the balanced equation. upon heating the mixture. Answer In-Lab Questions #3 and #4. Conclusion: In this lab, the decomposition of potassium chlorate was used to find the mass percentage of oxygen in potassium chlorate. Using the balanced equation and the fact that all the mass that is lost is oxygen gas, you can use stoichiometry to calculate the mass of potassium chlorate in the original mixture. When potassium chlorate (KClO 3) is heated, it thermally decomposes to produce solid potassium chloride and oxygen gas by the following balanced reaction in Eqn. Potassium chlorate, #KClO_3#, decomposes to form potassium chloride, #KCl# and oxygen gas. When the manganese dioxide is added, this will increase the rate of the production of oxygen in the reaction, … The Decomposition of Potassium Chlorate Hypothesis: Potassium chlorate decomposes into potassium chloride and oxygen gas, which means that when the glowing splint is inserted into the test tube, the flame will have enough fuel to fully reignite the splint. This can be theoretically calculated using atomic masses found on the periodic table, and experimentally calculated from lab data. 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