Iodide and Peroxodisulfate
4. The following mechanism has been proposed for the reaction of iodide and peroxodisulfate: Step 1: 1'- + 5,02 750,1+ SO , cate = Kx [I-17* * [scoz-]% Step 2: I'-+ SO,I > I, + SO, Step 3: I' + 1, -> 1, rate = 0044 * [I-]]' * [ Szeg ! a. According to the experimentally determined rate law (Experiment #6), identify the rate limiting step. Comment on why it is the rate limiting step. b. The overall reaction is exothermic. Draw a qualitative reaction coordinate diagram (you may need to look this up in your text book) showing the changes in potential energy as the three-step mechanism progresses. Label the reactants and final product, as well as each step on your diagram. The rate limiting step will have a larger activation energy. c. On your reaction coordinate diagram show the effect of a catalyst on the activation energy.
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