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Question
A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide.
- What kind of salt is sodium argentocyanide?
- Why is it preferred to silver nitrate as an electrolyte?
- State one condition to ensure that the deposit is smooth, firm and long lasting.
- Write the reaction taking place at the cathode.
- Write the reaction taking place at the anode.
Solution
- It is a complex salt.
- Sodium argentocyanide is preferred over silver nitrate because it gives a smooth and firm silver plating over the article.
- If silver nitrate is used, then the deposition of silver will be fast and not smooth.
- Reaction at Cathode:
\[\ce{Ag+ + e- -> Ag}\] - Reaction at Anode:
\[\ce{Ag − e- -> Ag+}\]
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