Write the equation for the extraction of silver by leaching with sodium cyanide and show that the leaching process is a redox reaction.
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In the case of silver metal, the sulphide ore is treated with sodium cyanide. Sodium argentocyanide complex is formed which on treating with zinc metal gives silver.
Ag
2
S+4NaCN→2Na[Ag(CN)
2
]+Na
2
S
2Na[Ag(CN)
2
]+Zn→Na
2
[Zn(CN)
4
]+2Ag↓.
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