1.

Ammonia forms the complex ion, [Cu(NH_(3))_(4)]^(2+) with copper ions alkaline solutions but not in acidic solution. This is because

Answer»

in acidic solutions, protons COORDINATE with ammonia molecules forming `NH_(4)^(+)` IONS and `NH_(3)` molecules are THUS, not available
in alkaline solutions, insolube `Cu(OH)_(2)` is precipitated which is an soluble in EXCESS of any alkali
copper hydroxide is an amphoteric substance
in acidic solutions, hydration protects copper ion.

Solution :In acidic solution, `NH_(3)` forms a coordinate bond with `H^(+)` to form `NH_(4)^(+)` ion which does not have a lone pair of electrons on N to act as a ligand.


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