slow and fast reaction
Asked Mar 17, 2009, 08:57 PM
The decomposition of hydrogen peroxide is catalyzed by iodide ion. The catalyzed reaction is thought to proceed by a two-step mechanism:
1. H2O2(aq) + I-(aq) → H2O(l) + IO-(aq) (slow)
2. IO-(aq) + H2O2(aq) → H2O(l) + O2(g) + I-(aq) (fast)
a. Assuming that the first step of the mechanism is rate determining, predict the rate expression for the overall process. b. Write the chemical equation for the overall process. c. Identify the intermediate, if any, in the mechanism. d. What distinguishes an intermediate from a catalyst in a chemical reaction?