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Question
What is the coordination entity formed when excess of liquid ammonia is added to an aqueous solution of copper sulphate?
Solution
When excess of liquid ammonia is added to an aqueous solution of copper sulphate to give tetraamminecopper (II) sulphate
\[\ce{\underset{\text{(Copper sulphate)}}{CuSO4} + \underset{\text{(Ammonia)}}{4NH3} -> \underset{\text{(tetraamminecopper (II) sulphate)}}{[Cu(NH3)4]SO4}}\]
Therefore, the coordination entity is \[\ce{[Cu(NH3)4]^2+}\]
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