Ammonia forms the complex ion [Cu(NH 3 ) 4 ] 2+ with copper ions in the alkaline…
Chemistry · NEET · NTA Exams — Coordination Compounds
Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in the alkaline solutions but not in acidic solutions. What is the reason for it?
- In acidic solutions hydration protects copper ions.
- In acidic solutions protons coordinate with ammonia molecules forming \(\mathrm{NH}_{4}^{+}\) ions and NH3 molecules are not available for co-ordination with metal.
- In alkaline solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali.
- Copper hydroxide is an amphoteric substance.
Answer
(B) In acidic solutions protons coordinate with ammonia molecules forming NH _ 4 ^ + ions and NH 3 molecules are not available for co-ordination with metal.
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