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Home » Archive » 2022 » issue #2 June 2022 » ISOPOLYVANADATE-TUNGSTATE ANION AT V:W=5:1 IN AQUEOUS SOLUTION AND IN CRYSTAL SALT COMPOSITION

UNIV. NEWS. NORTH-CAUCAS. REG. TECHNICAL SCIENCES SERIES. 2022; 2: 61-68

 

http://dx.doi.org/10.17213/1560-3644-2022-2-61-68

 

ISOPOLYVANADATE-TUNGSTATE ANION AT V:W=5:1 IN AQUEOUS SOLUTION AND IN CRYSTAL SALT COMPOSITION

O.I. Sazonova, А.I. Yatsenko

Sazonova Olga I. – Candidat Chemistry of Sciences, Associate Professor, Department «Materials, technologies and technical regulation of road construction», olja_c@mail.ru

Yatsenko Alexander I. – Assistant, Department «Materials, technologies and technical regulation of road construction», sashokika@yandex.ru

 

Abstract

Polycondensation processes of solutions containing НVO42- and WO42- ions in the ratio V:W=5:1 and the concentration С=10-2  mol/l in the range of ionic strength of the solution μ=0.1-0.5 mol/l were studied. Based on the results of mathematical modeling, diagrams of the distribution of individual and mixed vanadium(V) and tungsten (VI) isopolyanions in the wide range pH=2-13 (Z=0-3,50) against the background of nitrate ions were plotted. The formation of isopolyvanadate-tungstates of the 6th row НаVxW6-xO19((2+x)-а)- (x=5, а=1-7) that retain the specified initial ratio V:W=5:1 occurs in solutions,. The concentration constants for the formation of isopolyvanadate-tungstate anions in the studied aqueous solutions were determined. The compound Pr7V5WO19·47H2O was synthesised, the composition of which was identified by chemical and IR spectroscopic analysis.

 

Keywords: isopolyanions, mathematical modeling, vanadate, tungstate, isopolyvanadato-tungstate, pH-potentiometric ti-tration

 

Full text: [in elibrary.ru]

 

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