# How do I determine which is the reduction reaction in a hydrogen peroxide and potassium permanganate solution?

How was it determined that $\ce{MnO4-}$ was reduction, and $\ce{H2O2}$ was oxidation?

Also, why wasn’t the equation $$\ce{MnO4- + 2H2O + 3e- -> MnO2 +4OH-}$$ used? Or the $$\ce{H2O2 + 2H+ +2e- -> 2H2O}$$? (These are from the half equation tables)

• $\ce{KMnO4}$ is quite a powerful oxidizing agent, unless you add something really crazy like dioxygen difluoride to it, it's going to undergo reduction. – Pritt Balagopal Jun 1 '17 at 6:24