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Ion Electron Method

Balance the f...

Question

Balance the following equations by ion electron method.
$K I + C l_{2} \to K C l + I_{2}$ .

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Solution

$K I + C l_{2} \to K C l + I_{2}$
Ionic equation, $I^{-} + C l_{2} \to C l^{-} + I_{2}$
$1$ st step: Splitting into two half reactions,
$I^{-} \to I_{2} (O x i d a t i o n)$ ; $C l_{2} \to C l^{-} (R e d u c t i o n)$
$2$ nd step: Making number of atoms equal,
$2 I^{-} \to I_{2};$ $C l_{2} \to 2 C l^{-}$
$3$ rd step: Adding electrons to the sides deficient in electrons,
$2 I^{-} \to I_{2} + 2 e; C l_{2} + 2 e \to 2 C l^{-}$
$4$ th step: Adding both the half reactions,
$2 I^{-} + C l_{2} \to I_{2} + 2 C l^{-}$
Converting it into molecular form,
$2 K^{+} + 2 I^{-} + C l_{2} \to I_{2} + 2 C l^{-} + 2 K^{+}$
or
$2 K I + C l_{2} \to I_{2} + 2 K C l$ .

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