Ferrous (Fe^+2) salt reacts with potassium ferricyanide to form a blue precipitate which is called Turnbull's blue. The reaction is as follows:
Turnbull Blue: [Fe(II)]3[Fe(III)(CN)6]2
Ferrous (Fe^+2) salt reacts with potassium ferricyanide to form a blue precipitate which is called Turnbull's blue. The reaction is as follows:
Prussian blue is formed when ferric(Fe^3) salt reacts with ferrocyanide. Here we see both oxidation states of iron but only +2 oxidation states of iron are observed to form coordination complexes with cyanide. And the other +3 oxidation state iron ions form the net coordination compound.
(1) Stretching frequency of CO is inversely proportional to negative oxidation state of central metal atom