Analytical ChemistryHard

Question

Intense blue precipitate of Fe4[Fe(CN)6]3 and potassium hydroxide solution when mixed gives :

Options

A.K2Fe[Fe(CN)6] - white precipitate
B.Fe(OH)3 - reddish–brown precipitate
C.Fe(CN)3 - reddish-brown precipitate
D.KFe[Fe(CN)6] - Turnbull′s blue

Solution

Fe4[Fe(CN)6]3 + 12OH- → 4Fe(OH)3 ↓(reddish brown) + 3[Fe(CN)6]4-

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