AP Chemistry
5.11 Catalysis
5.7 Introduction to Reaction Mechanisms
A student adds a small amount of potassium iodide to accelerate the decomposition of residual hydrogen peroxide in a water sample. The proposed mechanism is shown below.
Step 1: \(\text{H}_2\text{O}_2\text{(aq)}+\text{I}^-\text{(aq)}\rightarrow\text{IO}^-\text{(aq)}+\text{H}_2\text{O(l)}\)
Step 2: \(\text{H}_2\text{O}_2\text{(aq)}+\text{IO}^-\text{(aq)}\rightarrow\text{I}^-\text{(aq)}+\text{H}_2\text{O(l)}+\text{O}_2\text{(g)}\)
Which species acts as a catalyst in the proposed mechanism?
Step 1: \(\text{H}_2\text{O}_2\text{(aq)}+\text{I}^-\text{(aq)}\rightarrow\text{IO}^-\text{(aq)}+\text{H}_2\text{O(l)}\)
Step 2: \(\text{H}_2\text{O}_2\text{(aq)}+\text{IO}^-\text{(aq)}\rightarrow\text{I}^-\text{(aq)}+\text{H}_2\text{O(l)}+\text{O}_2\text{(g)}\)
Which species acts as a catalyst in the proposed mechanism?
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