When ammonium hydroxide is added to solution B, a pale blue preci… - Vidyadip

Question

When ammonium hydroxide is added to solution $B$, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation [positive ion] present in solution $B$? what is the probable colour of solution $B.$

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Answer

$CuSO_4 + 2NH_4OH \rightarrow (NH_4)_2SO_4 + Cu(OH)_2$ [Pale blue]
The cation present in solution B is Copper $(Cu^{+2}).$
The colour of solution $B$ is Blue.
The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper [II] sulphate, an azure blue(deep blue) soluble complex salt.
$Cu(OH)_2 + (NH_4)_2SO_4 + 2NH_4OH \rightarrow [Cu(NH_3)_4]SO_4 + 4H_2O$

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