Ammonia forms the complex [Cu(NH3)4]^(2+...

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:

In acidic solution hydration protects copper ions

In alkaline solution insoluble `Cu(OH)_(2) is precipitated with excess of an alkali

Copper hydroxide is an amphoteric substance

In acidic solution protons coordinate with ammonia molecules are not variable.

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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 :

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.

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

In alkline solution `Cu(OH)_(2)` is precipitated which is soluble in exces 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)+^(+)` ion.