Ammonia forms the complex ion [Cu(NH_3)_4]^(2+)with copper ions in alk – InterviewSolution

1.	Ammonia forms the complex ion [Cu(NH_3)_4]^(2+)with copper ions in alkaline solutions but not in acidic solutions. The reason is
Answer» In acidic SOLUTIONS hydration protects copper ions In acidic solutions protons coordinate with ammonia molecules forming `NH_4^+`ions and `NH_3` molecules are not available 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

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