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Question
What happens when
NH3 solution is added to CuSO4 solution drop by drop and then in excess.
Solution
When NH3 solution is added to CuSO4 solution drop by drop, ammonia ions completely react with copper sulphate and precipitates of copper hydroxide are formed.
CuSO4(aq) + 2NH3(aq) + 2H2O(I) → Cu(OH)2(s) + (NH4)2SO4(aq)
But when we add excess of ammonia, the precipitate dissolves and a soluble complex is formed.
CuSO4(aq) + 4NH3(aq) → [Cu(NH3)4]SO4(aq)
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