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PRELAB: You are expected to come to lab with these questions answered. They will be taken up at the beginning of the lab period in which you perform this experiment. 1. The lab report gives you the net ionic equation rather than the molecular equation for the clock reaction. Were there any spectator ions present when you ran your reactions, if so what were they? 2. The two ions that react in this experiment are I-(iodide) and S₂O2 (persulfate). How many moles of each are present in the first reaction mixture which you make (Experiment 1 in Table 16.1)? What is the total volume of the solution these two ions are in initially (immediately after mixing but before any reaction has occurred)? 3. Explain briefly how the thiosulfate/starch indicator system works in this experiment. 4. In each reaction, the color changes when all the S2O32- (thiosulfate) is used up. How many moles of thiosulfate are placed in each reaction mixture? How many moles of I and S₂Og2- have been used up when the thiosulfate is gone? You will need to use the stoichiometry of the clock reaction and of the thiosulfate reaction to do this calculation. If the blue color appears in an experiment after 92 seconds, what is the rate of the reaction in M/sec or mol L-1 s-1?

PRELAB: You are expected to come to lab with these questions answered. They will be taken up at the beginning of the lab period in which you perform this experiment. 1. The lab report gives you the net ionic equation rather than the molecular equation for the clock reaction. Were there any spectator ions present when you ran your reactions, if so what were they? 2. The two ions that react in this experiment are I-(iodide) and S₂O2 (persulfate). How many moles of each are present in the first reaction mixture which you make (Experiment 1 in Table 16.1)? What is the total volume of the solution these two ions are in initially (immediately after mixing but before any reaction has occurred)? 3. Explain briefly how the thiosulfate/starch indicator system works in this experiment. 4. In each reaction, the color changes when all the S2O32- (thiosulfate) is used up. How many moles of thiosulfate are placed in each reaction mixture? How many moles of I and S₂Og2- have been used up when the thiosulfate is gone? You will need to use the stoichiometry of the clock reaction and of the thiosulfate reaction to do this calculation. If the blue color appears in an experiment after 92 seconds, what is the rate of the reaction in M/sec or mol L-1 s-1?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
Section: Chapter Questions
Problem 125QRT: A student set up an experiment for six different trials of the reaction between 1.00-M aqueous...
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PRELAB: You are expected to come to lab with these questions answered. They will be taken up at the beginning of the lab period in which you perform this experiment. 1. The lab report gives you the net ionic equation rather than the molecular equation for the clock reaction. Were there any spectator ions present when you ran your reactions, if so what were they? 2. The two ions that react in this experiment are I-(iodide) and S₂O2 (persulfate). How many moles of each are present in the first reaction mixture which you make (Experiment 1 in Table 16.1)? What is the total volume of the solution these two ions are in initially (immediately after mixing but before any reaction has occurred)? 3. Explain briefly how the thiosulfate/starch indicator system works in this experiment. 4. In each reaction, the color changes when all the S2O32- (thiosulfate) is used up. How many moles of thiosulfate are placed in each reaction mixture? How many moles of I and S₂Og2- have been used up when the thiosulfate is gone? You will need to use the stoichiometry of the clock reaction and of the thiosulfate reaction to do this calculation. If the blue color appears in an experiment after 92 seconds, what is the rate of the reaction in M/sec or mol L-1 s-1?
Transcribed Image Text:PRELAB: You are expected to come to lab with these questions answered. They will be taken up at the beginning of the lab period in which you perform this experiment. 1. The lab report gives you the net ionic equation rather than the molecular equation for the clock reaction. Were there any spectator ions present when you ran your reactions, if so what were they? 2. The two ions that react in this experiment are I-(iodide) and S₂O2 (persulfate). How many moles of each are present in the first reaction mixture which you make (Experiment 1 in Table 16.1)? What is the total volume of the solution these two ions are in initially (immediately after mixing but before any reaction has occurred)? 3. Explain briefly how the thiosulfate/starch indicator system works in this experiment. 4. In each reaction, the color changes when all the S2O32- (thiosulfate) is used up. How many moles of thiosulfate are placed in each reaction mixture? How many moles of I and S₂Og2- have been used up when the thiosulfate is gone? You will need to use the stoichiometry of the clock reaction and of the thiosulfate reaction to do this calculation. If the blue color appears in an experiment after 92 seconds, what is the rate of the reaction in M/sec or mol L-1 s-1?
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