1.

Ammonia forms the complex [Cu(NH_(3))_(4)]^(2+) with copper ions in alkaline solution but not in acid solution. The reason for it is :

Answer»

in alkaline solution `Cu(OH)_(2)` is precipitated which is soluble in EXCESS of alkali.
copper HYDROXIDE is amphoteric.
in acidic solution hydration protects `Cu^(2+)` IONS.
in acidic solution protons coordinates with ammonia MOLECULES are not forming `NH_(4)^(+)` ions and `NH_(3)` molecules are not available.

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