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Question
Describe the role of the NaCN in the extraction of silver from silver ore.
One Line Answer
Short Note
Solution
It reacts with the silver ore, Ag2S, (Argentite) to form soluble complex from which silver can be displaced by adding more electropositive metal like Zn
\[\ce{Ag2S + 4NaCN + 2O2<=> 2Na[Ag(CN)2] +Na2SO4}\]
\[\ce{2Na[Ag(CN)2] + Zn -> Na2[2n(CN)4] + 2Ag↓}\]
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