H2O2(aq) + 3I-(aq) + 2 H+(aq) I3-(aq) + 2 H2O(aq)The reaction above is often very slow, so a catalyst is usually added. Ammonium molybdate works; so do other transition metal ions. The catalytic action probably involves a free radical mechanism. Hydrogen peroxide can reduce MnO4-, but molybdate isn't a strong enough oxidizing agent to be reduced.
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