On adding excess of N H 4 O H to copper sulphate solution

Question

On adding excess of N H 4 O H to copper sulphate solution, A deep blue solution is obtained, A blue precipitate of C u ( O H ) 2 is obtained, A black precipitate of CuO is obtained, No change takes place

MARKS App · Accepted Answer

With ammonium solution, C u S O 4 forms a stable blue complex. First it forms a precipitate of C u ( O H ) 2 which dissolves in excess of ammonia solution forming a deep blue coloured complex. C u S O 4 + 2 N H 4 O H → C u ( O H ) 2 + ( N H 4 ) 2 S O 4 Cu ( OH ) 2 + 2 NH 4 OH + ( NH 4 ) 2 SO 4 → Cu ( NH 3 ) 4 SO 4 + 4 H 2 O Tetraamminecupricsulphate

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