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General Principles And Processes Of Isolation Of Elements

Question

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Describe a method for refining nickel.

Solution

Nickel is refined by Mond's process. Nickel when heated in a stream of carbon monoxide forms volatile nickel carbonyl Ni(CO)_4.The carbonyl vapour when subjected to still higher temperature undergoes thermal decomposition giving pure metal.

$\underset{(Impure)}{Ni} + 4 CO \overset{330 - 350 K}{\to} \underset{Nickel Carbonyl}{Ni (CO)_{4}} Ni (CO)_{4} \overset{450 - 470 K}{\to} \underset{Pure}{Ni} + 4 CO$

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