Explain the application of complexes in the extraction of metals. Write chemical
equations involved.
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Answer:
Dilute NaCN solution is used in presence of oxygen (from air) for leaching gold sample.
4Au(s)+8CN
−
(aq)+2H
2
O(aq)+O
2
(g)→4[Au(CN)
2
]
−
(aq)+4OH
−
(aq)
Zinc displaces gold from the complex [Au(CN)
2
]
−
(aq).
Zn(s)+2[Au(CN)
2
]
−
(aq)→[Zn(CN)
4
]
2−
(aq)+2Au(s)
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