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
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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