STUDY OF THE INFLUENCE OF SOME FACTORS ON THE INTERACTION PROCESS IN THE SYSTEMS К3[Fe(CN)6] – VOSO4·3H2O/NiSO4·7H2O – H2O AND К3[Fe(CN)6] – VOSO4·3H2O– NiSO4·7H2O – H2O

Report 1. The effect of time on the interaction in the system К3[Fe(CN)6] – VOSO4·3H2O – H2O

Abstract

The process of interaction in the equimolecular system К3[Fe(CN)6]–VOSO4·3H2O– H2O was studied spectrophotometrically. It was revealed that the intense absorption band at 778 nm, characteristic of VOSO4·3H2O, disappears in the spectrum. The absorption band broadens in the area of 338-430 nm with max at 361 nm, referring to the ultraviolet area, and wider max at 415 nm, lying in the visible area. The revealed changes in the spectral pattern in the system under study indicate the process of interaction of its components with the formation of a complex compound. It was established that with increasing time from 5 to 180 minutes the pH of the system decreases from 3.1 to 2.39, and at 1440 minutes it increases to 2.87. The residual content of hexacyanoferrate (III) of the ion [Fe(CN)6]3- in the liquid phase of the system under study in the interval (5-30) min increases, and a further increase in time decreases. That is, the degree of their binding decreases and then increases. In the filtrate obtained at 30 minutes the residual content of hexacyanoferrate (III) ions increases 2.5 times, and at 1440 minutes it decreases 5.5 times as compared with the filtrate obtained at 15 minutes.

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