Why is KMnO_4 an oxidizing agent?

1 Answer
anor277
Aug 11, 2016

Because manganese metal is in its highest oxidation state (Mn(VII+), and it is likely to be reduced in any reaction.

Explanation:

And if it is likely to be reduced, it is an electron sink, and therefore an "oxidizing agent". Typically, permanganate is reduced to colourless Mn^(2+):

MnO_4^(-) + 8H^(+) + 5e^(-)rarr Mn^(2+) + 4H_2O

Mass and charge are balanced here, so at least the reaction is viable. The macroscopic change is usually from deeply purple permanganate to almost colourless Mn^(2+) ion, so this reaction is convenient in that it is self-indicating.

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