Questions: 1. The volume of each the reagents listed in Table 1 are varied one a
ID: 509219 • Letter: Q
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Questions: 1. The volume of each the reagents listed in Table 1 are varied one at a time in turn except for the volume of sodium thiosulfate, which is the same in each trial. Why do we keep the volume of sodium thiosulfate the same in each trial? 2. In Part A, even though the concentrations of the reactants are changed in each trial, the experimentally determined values of the rate constant k, for each trial should be fairly similar. Why is this? 3. How do your results from Part B also support your answer to the previous question? 4. What is the qualitative relationship between reaction rate and temperature obtained from your results in Part B? Can you give a physical explanation to explain this? What is occurring on the molecular level?Explanation / Answer
1. In this reaction, KI , KBrO3 and HCl reacts and you are measuring the reaction rate. Na2S2O3 is used to indicate how much I2 is produced in the previously mentioned reaction (by color change). So, its amount has no role in reaction rate. Ans in all the measurements same amount of Na2S2O3 is used.
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2. Rate constant is independent of the concentration of the reactants (hence the name rate "constant"). So, even if you take different amount of reactant, rate constant (k) will have same value.
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