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Nitrogen

Commercial ni...

Question

Commercial nitrogen is passed through copper chips kept in ammonia solution for removing oxygen. Why?

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Solution

Copper reacts with ammonia in presence of oxygen forming a soluble complex
$2 C u + 2 H_{2} O + O_{2} + 8 N H_{3} ⟶ 2 [C u (N H_{3})_{4}] (O H)_{2}$

Tetraamine copper (II) hydroxide

Thus, commercial nitrogen is passed through copper chips kept in ammonia solution for the removal of the oxygen.

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(vi) Ammonia solution to an amphoteric hydroxide.
(vii) Ammonia to ammonium carbonate.
(viii) Copper oxide to copper.

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