Analytical ChemistryHard
Question
An original solution of an inorganic salt in dilute HCl gives a brown colouration with potassium hexacyanidoferrate (III) and reddish brown colouration with sodium acetate solution. The cation of the salt is :
Options
A.Ni2+
B.Fe3+
C.Cu2+
D.none
Solution
Fe3+ + [Fe(CN)6]3- → Fe[Fe(CN)6] brown colouration
3Fe3+ + 6CH3COO- + 2H2O ⇋ [Fe3(OH)2(CH3COO)6]+ + 2H+.
3Fe3+ + 6CH3COO- + 2H2O ⇋ [Fe3(OH)2(CH3COO)6]+ + 2H+.
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