How does ammonia react with solution of Cu?

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Solution

Ammonia acts as a lewis base due to the presence of lone pair of electrons on the nitrogen atom. Ammonia reacts with solution $C u^{2 +}$ to form a deep blue coloured complex. The reaction is
$C u^{2 +} (a q) + 4 N H_{3} (a q) ⇌ [C u (N H_{3})_{4}]_{(a q)}^{2 +}      d e e p b l u e$

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