K 2 SO 4 solution mixed with Cr 2 (SO 4 ) 3 solution in 1 : 1 molar ratio gives the test of Cr 3+ 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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K 2 SO 4 .Cr 2 (SO 4 ) 3 
2K + (aq) + 2Cr 3+ (aq) + 4SO 4 2–
So chrome alum is a double salt. It when dissolved in water gives its constituent ions. Hence it gives the test of K + , Cr 3+ and SO 4 2– ions.
CuSO 4 .4NH 3 [Cu(NH 3 ) 4 ] SO 4 
[Cu(NH 3 ) 4 ] 2+ (aq) + SO 4 2– (aq)
As copper (II) is present in coordination sphere it will not give the test of Cu 2+ ion.
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