When a few drops of NH3 solution are added to Cu^2+ solution, a pale blue precipitate forms; with excess NH3 it dissolves to give a deep blue solution. The deep blue species is

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When a few drops of $NH X_{3}$ solution are added to $Cu X^{2 +}$ solution, a pale blue precipitate forms; with excess $NH X_{3}$ it dissolves to give a deep blue solution. The deep blue species is

Excess ammonia replaces water around copper(II) to give the tetraammine complex

[Cu (NH X_{3}) X_{4}] X^{2 +}

, which is deep blue.