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Question
What do you observe when Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
Solution
Initially when ammonium solution is added to aqueous solution of
copper sulphate a bluish precipi tate of copper hydroxide is obtained
which dissolves in excess of ammonium hydroxide.
\[\ce{CuSO4 + 2NH4OH -> (NH4)2SO4 + Cu(OH)2}\]
\[\ce{Cu(OH)2 + (NH4)2SO4 + 2NH4OH -> (Cu(NH3)4)SO4 + 4H2O}\]
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