AP Chemistry
5.8 Reaction Mechanism and Rate Law
5.7 Introduction to Reaction Mechanisms
5.4 Elementary Reactions
A proposed two-step mechanism for the decomposition of hydrogen peroxide, \(\text{H}_2\text{O}_2\text{(aq)}\), in the presence of iodide ions is shown below:
\[ \text{Step 1: } \text{H}_2\text{O}_2\text{(aq)} + \text{I}^-\text{(aq)} \rightarrow \text{IO}^-\text{(aq)} + \text{H}_2\text{O(l)} \quad (\text{slow}) \]
\[ \text{Step 2: } \text{H}_2\text{O}_2\text{(aq)} + \text{IO}^-\text{(aq)} \rightarrow \text{I}^-\text{(aq)} + \text{H}_2\text{O(l)} + \text{O}_2\text{(g)} \quad (\text{fast}) \]
Which of the following correctly identifies the role of \(\text{IO}^-\text{(aq)}\) in this mechanism and gives the rate law for the rate-determining elementary step?
\[ \text{Step 1: } \text{H}_2\text{O}_2\text{(aq)} + \text{I}^-\text{(aq)} \rightarrow \text{IO}^-\text{(aq)} + \text{H}_2\text{O(l)} \quad (\text{slow}) \]
\[ \text{Step 2: } \text{H}_2\text{O}_2\text{(aq)} + \text{IO}^-\text{(aq)} \rightarrow \text{I}^-\text{(aq)} + \text{H}_2\text{O(l)} + \text{O}_2\text{(g)} \quad (\text{fast}) \]
Which of the following correctly identifies the role of \(\text{IO}^-\text{(aq)}\) in this mechanism and gives the rate law for the rate-determining elementary step?
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