FeSO4 solution mixed with (NH4)2SO4 solution in 1 : 1 molar ratio gives the test of Fe^2+ ion but CuSO4 solution mixed

Monjur Alahi

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?


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Salim Ahmed Kawsar

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i. 1 : 1 molar mixture of FeSO4 and (NH4)2SO4 forms a double salt, FeSO4.(NH4)2SO4.6H2O (Mohr’s salt) which exists only in solid state. In aqueous solution, it dissociates into ions Fe2+, NH4 + and SO42-. Hence, it gives the test of Fe2+ ion.

ii. 1 : 4 molar mixture of CuSO4 and ammonia forms a coordination compound, [Cu(NH3)4]SO4. In aqueous solution, it retains its identity and does not dissociate into ions. Hence, it does not give the
test of Cu2+ ion.

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