Abstract
The kinetics of reaction between ferrocyanide and ferric ions under acidic conditions was studied at fixed ionic strength (0.1 M) and (25 ± 0.1) o C by using the stopped flow technique, under limiting conditions of [ferrocyanide] and with other reactants in excess. The reaction had first-order dependence on ferrocyanide, Fe(III) and H + ion concentrations and had negative salt effect. On the basis of the experimental findings, a plausible mechanism for the formation of soluble form of Prussian blue (KFe{Fe(CN) 6 }x H 2 O) and rate law are proposed. The activation parameters for the title reaction are estimated. A relatively low energy of activation (23 kJ mol -1 ) and high negative entropy of activation (-231 J K -1 mol -1 ) agree well with the proposed mechanism and configuration of complex ion leading to the formation of insoluble Prussian blue, Fe 4 {Fe(CN) 6 } 3 y H 2 O. KEY WORDS : Prussian blue, Kinetics, Ferrocyanide, Salt effect, Ferricferrocyanide Bull. Chem. Soc. Ethiop. 2009 , 23(1), 47-54.
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