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Ion Electron Method

Balance the f...

Question

Balance the following equation by ion electron method:
$H g S + C l^{-} + H^{+} + N O_{3}^{-} \to H g C l_{4}^{2 -} + S + N O + H_{2} O$ .

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Solution

Half reactions
$[H g S + 4 C l^{-} \to H g C l_{4}^{2 -} + S + 2 e] \times 3$
$[N O_{3}^{-} + 4 H^{+} + 3 e \to N O + 2 H_{2} O] \times 2$
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$3 H g S + 12 C l^{-} + 2 N O_{3}^{-} + 8 H^{+} \to 3 H g C l_{4}^{2 -} + 3 S + 2 N O + 4 H_{2} O$

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