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25 June, 00:33

The decomposition of hydrogen peroxide is given by the following reaction:2 H2O2 (aq) → 2 H2O (l) + O2 (g) In the presence of KI the reaction is thought to occur by the following mechanism:Step 1: H2O2 + I - → H2O + IO-Step 2: IO - + H2O2 → H2O + O2 + I-What is the role of I - in this mechanism?

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  1. 25 June, 00:58
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    Role of I⁻ in this mechanism is a catalyst

    Explanation:

    The decomposition of hydrogen peroxide is catalyzed as shown below.

    The catalyzed reaction is thought to proceed by a two-step mechanism:

    H₂O₂ + I⁻ → H₂O + IO⁻ (slow)

    IO⁻ + H₂O₂ → I⁻ + H₂O + H₂O₂ (fast)

    The rate law for the overall process Rate=k [H₂O₂][I⁻ ] according to slow elementary step. However, it's not consumed in the reaction and therefore changing its concentration does not impact rate. Its behavior as a catalyst will impact the value for k. This is often designated with k' so we can write the rate law as: Rate=k' [H₂O₂]
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