Coordination Compounds

Short Answer Type

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FeSO4 solution mixed with (NH4)2SO4 solution in 1 : 1 molar ratio gives the test of Fe2+ ion but CuSO4 solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu2+ ion. Explain why?

FeSO4 does not form any complex with (NH4)2SO4. Instead, .they form a double salt, FeSO4, (NH4),SO4.6H2O which dissociates completely into ions.

FeSO4 +6H2O+(NH4)2SO4 --> FeSO4.(NH4)2SO4.H2O

But CuSO4 combines with NH3 to form the complex [Cu(NH3)4]SO4 in which the complex ion [Cu(NH3)4]2+does not dissociate to give Cu2+ions.


CuSO4 +4NH3 +5H2O-->[Cu(NH3)4]SO4.5H2O
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