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