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Ion Electron Method

Balance the f...

Question

Balance the following equation by ion electron method.
$C_{2} H_{5} O H + I_{2} + O H^{-} \to C H I_{3} + {H C O_{2}}^{-} + I^{-} + H_{2} O$

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Solution

Half reactions
$[C_{2} H_{5} O H + 3_{/ 2} I_{2} + 6 O H^{-} \to C H I_{3} + H C O_{2}^{-} + 5 H_{2} O + 5 e] \times 2$
$[I_{2} + 2 e \to 2 I^{-}] \times 5$
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$2 C_{2} H_{5} O H + 8 I_{2} + 12 O H^{-} \to 2 C H I_{3} + 2 H C O_{2}^{-} + 10 I^{-} + 10 H_{2} O$
or $C_{2} H_{5} O H + 4 I_{2} + 6 O H^{-} \to C H I_{3} + H C O_{2}^{-} + 5 I^{-} + 5 H_{2} O$

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