STUDY OF THE INTERACTION OF THE HEXACYANOFERRATE (III) ION, VANADIUM AND NICKEL(II)CONTAINING SYSTEMS

Message 1. Study K3[Fe(CN)6] – VOSO4·3H2O/NiSO4·7H2O – H2O systems

Abstract

The interaction process in the double equimolecular systems K3[Fe(CN)6] – VOSO4·3H2O/NiSO4·7H2O – H2O was studied using the pH metric titration method. It is established that in the hexacyanoferrate (III) ion, vanadijsoderzhashchih the system of curves of titration with a solution of sodium gidroksid are complex. There are three distinct buffer zones (0<pH<2.75; 2.75<pH<6.75; 6.75<pH<8) and one weakly defined buffer zone in the pH range from 8.9 to 10.6. In an acidic medium, the process of complex formation occurs, accompanied by a decrease in the pH of the medium, which corresponds to the first jump on the titration curve in the pH range 3.3-5.0. With a further increase in the alkalinity of the medium 6.3 to 10 pH, the conditions for the oxidationreduction processes with the formation of vanadates (5+) and hexacyanoferrate (II) ions, as well as vanadium hydroxide V(OH)2 are created. The titration curve in the double system K3[Fe (CN)6] – NiSO4·7H2O – H2O has one buffer region in the alkaline medium (pH 8). In an acidic environment, the process of complex formation with the formation of Nickel ferrocyanide. As the ON - ions accumulate in the system, the observed region with a constant pH 8 indicates the formation of Nickel hydroxide in the system. The solution becomes greenish and becomes cloudy.

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