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Question
Describe a method for refining nickel.
Solution
The impure nickel is heated in a stream of carbon monoxide at around 350 K. The nickel reacts with the CO to form a highly volatile nickel tetracarbonyl. The solid impurities are left behind.
\[\ce{Ni_{(s)} + 4CO_{(g)} -> Ni(CO)4_{(g)}}\]
On heating the nickel tetracarbonyl around 460 K, the complex decomposes to give pure metal.
\[\ce{Ni(CO)4_{(g)} -> Ni_{(s)} + 4CO_{(g)}}\]
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