Ammonia forms the complex [Cu(NH_(3))_(4)]^(2+) withcopper ion in alkaline solution but not in acidic solution. This is due to the reason that :

Ammonia forms the complex [Cu(NH_(3))_(4)]^(2+) withcopper ion in alka

1.	Ammonia forms the complex [Cu(NH_(3))_(4)]^(2+) withcopper ion in alkaline solution but not in acidic solution. This is due to the reason that :
Answer» in alkaline solution insoluble `Cu(OH)_(2)` is PRECIPITATED which is SOLUBLE in EXCESS of any alkali `Cu(OH)_(2)` is amphoteric in acidic solution hydration protects `Cu^(2+)` ion in acidic solution, proton coordinates with `NH_(3)` forming `NH_(4)^(+)` ion and `NH_(3)` is not available Solution :It is the correct answer. `OVERSET(..)(N)H_(3) + underset(("ACID"))(H^(+)) rarr NH_(4)^(+)` Lone pair is not available for co-ordination with `Cu^(2+)` ion