What would you observe when Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulfate?

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Solution

When an aqueous solution of ammonium hydroxide is added to the solution of Copper sulphate, a pale blue colored precipitate of Copper hydroxide is formed..
CuSO₄(aq) + 2NH₄OH (aq) ⇢ Cu(OH)₂ (ppt) + (NH₄)₂SO₄(aq)
This Copper hydroxide of light blue color dissolves in excess of Ammonium hydroxide to yield a deep blue solution containing the complex ion,tetraamminecopper(II)
Cu(OH)₂ (ppt) + NH₄OH(aq) ⇢ Cu(NH₃)₄(OH)₂(aq) + 4 H₂O (aq)

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