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Ion Electron Method

Balance the f...

Question

Balance the following equation by ion electron method:
$C r (O H)_{3} + C l O^{-} + O H^{-} \to C r O_{4}^{2 -} + C l^{-} + H_{2} O$ .

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Solution

Half reactions
$[C r (O H)_{3} + 5 O H^{-} \to C r O_{4}^{2 -} + 4 H_{2} O + 3 e] \times 2$
$[C l O^{-} + H_{2} O + 2 e \to C l^{-} + 2 O H^{-}] \times 3$
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$2 C r (O H)_{3} + 4 O H^{-} + 3 C l O^{-} \to 2 C r O_{4}^{2 -} + 3 C l^{-} + 5 H_{2} O$
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