1(iii)
What do you observe when ammonium hydroxide solution is added first dropwise and then in excess to a solution of copper sulphate?
- (a)A pale blue precipitate that is insoluble in excess of ammonium hydroxide is seen.
- (b)A curdy white precipitate that is soluble in excess of ammonium hydroxide is seen.
- (c)A pale blue precipitate is formed that dissolves in excess of ammonium hydroxide to form a deep blue solution.
- (d)A curdy white precipitate that is insoluble in excess of ammonium hydroxide is seen.
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A pale blue precipitate is formed that dissolves in excess of ammonium hydroxide to form a deep blue solution.
Reason — On adding ammonium hydroxide dropwise, a pale blue precipitate of copper hydroxide is formed. In excess ammonium hydroxide, the precipitate dissolves to form a deep blue solution of tetraammine copper(II) sulphate.
CuSO4 + 2NH4OH ⟶ Cu(OH)2 ↓ [pale blue] + (NH4)2SO4