Practice question
Question
What is the coefficient of H₂O when the reaction MnO₄^- + I^- -> MnO₂ + I₂ is balanced in basic medium?
Explanation
Using the half-reaction method: Oxidation: 2I^- -> I₂ + 2e^- . Reduction: MnO₄^- + 2H₂O + 3e^- -> MnO₂ + 4OH^- . Equalize electrons (6), combine: 2MnO₄^- + 6I^- + 4H₂O -> 2MnO₂ + 3I₂ + 8OH^- . Coefficient of H₂O is 4.
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