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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?
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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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