What Is The Role Of Zn Metal In The Extraction Of Silver?
During the extraction of silver, the finely powdered silver ore is treated with a dilute KCN solution to form a cyano complex of silver.
Ag2S + 4NaCN ⇌ 2Na[Ag(CN)2 ] + Na2S
Zinc is more electropositive than silver and it displaces silver from the soluble cyanide complex.
\( 2Na[Ag(CN)_2]+Zn \to Na_2[Zn(CN)_2]+2Ag \)
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