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Ion Electron Method

Balance the f...

Question

Balance the following equation by ion electron method.
$M n O_{2} + O H^{-} + O_{2} \to {M n O_{4}}^{2 -} + H_{2} O$

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Solution

Half reactions are as :
$[M n O_{2} + 4 O H^{-} \to M n O_{4}^{2 -} + 2 H_{2} O + 2 e] \times 2$
$O_{2} + 2 H_{2} O + 4 e \to 4 O H^{-}$
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$2 M n O_{2} + 4 O H^{-} + O_{2} \to 2 M n O_{4}^{2 -} + 2 H_{2} O$

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