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Get Answers to all your Questions
9.2 solution mixed with
solution in 1:1 molar ratio gives the test of
ion but
solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of
ion. Explain why?
Answers (1)
FeSO4.(NH4)2SO4.6H2O →Fe2+ + SO42- + 2NH4+ + 6H2O
Fe2+ ions are free and form a green precipitate with potassium ferricyanide.
While Cu2++ 4NH3 → [Cu(NH3)4]2+
So Cu2+ ions are not free and will not form blue precipitate with potassium ferrocyanide.
The major difference between both the compounds is that the first compound is a salt and the other one is a coordination compound. In case of double salt compounds (Mohr's salt), the compound breaks into its constituent ions when dissolved in water, therefore it gives a positive test for the presence of Fe2+. But in case of coordinate compounds, they maintain their identity in both solid and dissolved state. Thus the individual property of each constituent is lost. And therefore it doesn't give a positive test for Cu2+.
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