6.5 Copper can be extracted by hydrometallurgy but not zinc. Explain.
6.5 Copper can be extracted by hydrometallurgy but not zinc. Explain.
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1 Answer
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Copper can be extracted by hydrometallurgy but not zinc as per the below-given reason:
The Eo of zinc ( Zn2+/Zn = - 0.76V) is lower than that of copper (Cu2+/Cu = 0.34V). this means that zinc is a stronger reducing agent and can displace copper from a solution of Cu2+ ions.
Zn (s) + Cu2+ (aq) → Zn2+ + Cu (s)
In order to displace zinc by hydrometallurgy, we need stronger reducing agent like K ( EoK+/K = - 2.93V)
2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)
As a result, these metals cannot be used in hydrometallurgy to extract zinc. Hence, copper can be
extracted by hydrometallurgy but not zinc.
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