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One purpose of adding KIO4 is to prevent the permanganate ion from being slowly reduced to Mn+2 by H2O. Write a balanced redox equation for the reduction of permanganate ion to Mn+2 by water in acid solution.

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MnO4^- + 8H^+ + 5e ==> Mn^2+ + 4H2O
Don't memorize these half reactions; there are thousands. Instead, learn how to write them. Here is a site OR ask specific questions about what you may not understand.
http://www.chemteam.info/Redox/Redox.html
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