When copper (ii) sulphate solution is treated with excess...
When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution.
This deep blue solution is a?
Cu(OH)2
CuSo4.5H2O
(NH4)2SO4
Cu(NH3)4(OH)2
CuSO4.(NH4)2SO4.2H2O
Correct answer is D
CuSO4+2NH4OH→(NH4)2SO4+Cu(OH)2(pale−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+(NH4)2SO4+2NH4OH→[Cu(NH3)4]SO4+4H2O