Analytical ChemistryHard

Question

K4[Fe(CN)6] can be used to detect one or more out of Fe2+, Fe3+, Zn2+, Cu2+, Ag+, Ca2+ :

Options

A.only Fe2+, Fe3+
B.only Fe3+,Zn2+,Cu2+
C.all but not Ca2+
D.all of these.

Solution

Fe2+ + [Fe(CN)6]4- → white precipitate          ;    Fe3+ + [Fe(CN)6]4- → Prussian blue precipitate.
Zn2+ + [Fe(CN)6]4- → Bluish white/white precipitate  ;     Cu2+ + [Fe(CN)6]4- → chocolate brown precipitate
Ag+ + [Fe(CN)6]4- → white precipitate          ;     Ca2+ + K4[Fe(CN)6]4- → white precipitate.

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