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Explain why potassium cyanide is used in...

Explain why potassium cyanide is used in silver- plating. Give chemical equation.

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`KCN` is used because it reacts with `AgNO_(3)` to form potassium argentocyanide `(K[Ag(CN)_(2)])`. This complex is actually used as the electrolyte in silver plating.
`AgNO_(3)+2KCNrarrK[Ag(CN)_(2)]+KNO_(3)`
If only `AgNO_(3)` solution is used as the electrolyte, the electroplating process will be very fast and the layer of silver formed will be no longer uniform.
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