STUDY OF INTERACTION IN HEXACIANOFERRATE (III) -, VANADYL - AND NICKEL (II) - CONTAINING SYSTEMS

Post 2. Study of the system К3[Fe(CN)6] – VOSO4·3H2O – NiSO4·7H2O – H2O

Abstract

In this paper considered study of interaction process in the system К3[Fe(CN)6] – VOSO4·3H2O – NiSO4·7H2O – H2O, using the pH metric titration method in the pH range 2-12. It was established that the nature of the titration curves of an aliquot of the studied system with sodium hydroxide solution depends on its concentration. The most complex character is the titration curve of 0.1 mol/L sodium hydroxide, on which mild leaps are recorded at pH 3.4 and 4.0 and intense leaps at pH 5.6 and 7.7. Conditions for the formation of complex compounds of vanadium and nickel ferrocyanides in acidic medium are created. In this system as well as vanadium and nickel hydroxides were formed in alkaline medium. Precipitates of various shapes and colors, the color characteristic of which corresponds to the above-mentioned compounds, are separated from the studied system.

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