Ammonia forms the complex ion [ {\Cu} ( {\NH}_3) _4] ^{2+} with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Question

Ammonia forms the complex ion  [ {\Cu} ( {\NH}_3) _4] ^{2+} with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Examsnet · Accepted Answer

Correct Answer is : In acidic solutions protons coordinate with ammonia molecules forming NH4+ions and NH3 molecules are not available

AIEEE 2003 Chemistry Solved Paper