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FeSO4 solution mixed with (NH4)2SO4 solu...

`FeSO_4` solution mixed with `(NH_4)_2SO_4` solution is `1:1` molar ratio gives the test of `Fe^(2+)` ion but `CuSO_4` solution mixed with aqueous ammonia in `1:4` molar ratio does not give the test of `Cu^(2+)` ion. Explain why?

Text Solution

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`FeSO_(4)` solution does not form any complex with `(NH_(4))_(2)SO_(4)`. Instead, they form a double salt, `FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O` which dissociates completely into ions in the solution. But `CuSO_(4)` combines with `NH_(3)` to form the complex `[Cu(NH_(3))_(4)]SO_(4)` in which the complex ion `[Cu(NH_(3))_(4)]^(2+)` does not dissociate to give `Cu^(2+)` ions.
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