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