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Исследование взаимодействия вольфрамата натрия и d-(+)-винной кислоты в водных растворах

Исследование взаимодействия вольфрамата натрия и d-(+)-винной кислоты в водных растворах

Abstract

Методами поляриметрии, криоскопии и -метрии в широком интервале состава изучены изомолярные (в случае криоскопии -изомоляльные) серии (C_M= 0,1, 0,3, 0,5 и 0,7 моль/л) водных растворов вольфрамата натрия и D-(+)-винной кислоты. Опытные кривые зависимостей величины угла вращения плоскости поляризации света(кривыеα_D^20=f(x)), понижения температуры замерзания (∆T_(зам.) ) и pH изомолярных (изомоляльных) водных растворов от состава сравнены с соответствующими кривыми, рассчитанными в предположении отсутствия взаимодействия между компонентами. На основании экспериментальных данных установлено, что в результате взаимодействия между вольфраматом натрия и D-(+)-винной кислотой образуется продукт присоединения с соотношением компонентов 1:1. Определены удельное вращение, зависимости понижения температуры замерзания и pHводных растворов от концентрации продукта присоединения. Установлено, что продукт присоединения является слабой комплексной кислотой. Оценена константа диссоциации кислоты.

Izomolyar series of water solutions of sodium tungstate and D-(+)-tartaric acid by polarimetry, cryoscopy and pHmetry methods in a wide interval of structure has been studied. Experimental curves describing the dependences of size of a rotation corner of a polarization-plane of light, falling of temperature of freezing and pH of izomolyar aqueous solutions on structure has been compared to the corresponding curves calculated in the assumption of absence of interaction between components. On the basis of experimental data has been established, that a result of interaction between sodium tungstate and D-(+)tartaric acid forms a product of joining with a parity of components 1:1. Dependence of specific rotation, fall of temperature of freezing and pH of water solutions from concentration of product of joining are defined. It hasestablished, that the joining product is weak complex acid. The constant of dissosation of acid has been estimated.

Keywords

КРИОСКОПИЯ., ПОЛЯРИМЕТРИЯ, ВОЛЬФРАМАТ НАТРИЯ, D-(+)-ВИННАЯ КИСЛОТА, CRYOSCOPY., D-(+)-TARTARIC ACID

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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