1.

Ammonia forms the complex [Cu(NH_3)_4]^(2+) with copper ions in alkaline solution but not in acid solution. The reasons for it is:

Answer»

In alkaline solution `Cu(OH)_(2)` is precipitated which is soluble in excess of alkali
Copper hydroxide is AMPHOTERIC substance
In ACIDIC solution hydration protects `Cu^(2+)` ions
In acidic solution protons are COORDINATED with AMMONIA MOLECULES forming `NH_(4)^(+)` ions

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