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How can a a thin layer of silver be deposited on a brass spoon?

Posted by Rajnish Roy 5 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 2 months ago

The process of depositing a thin layer of silver electrolytically on the metal surface is called silver plating. The article to be silver-plated is used as cathode while anode consists of pure silver.

The bath contains a solution of potassium argentocyanide (AgNO₃ + excess of KCN). The complex ion is very stable and ionisation is very small at a time with the result slow and uniform deposition of silver takes place.

[Ag(CN)₂]₂ ⇌ Ag₊+2CN⁻

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