Article 5216

Title of the article

INFLUENCE OF SOLUTION’S pH ON EQUILIBRIUM CONCENTRATIONS
OF CHROMATE AND DICHROMATE IONS

Authors

Perelygin Yuriy Petrovich, Doctor of engineering sciences, professor, head of sub-department of chemistry, Penza State University (40 Krasnaya street, Penza, Russia), pyp@pnzgu.ru
Jaskula Marian J., Phd, professor, sub-department of physical chemistry and electrochemistry, Jagiellonian University (3 Ingardena street, 30-060, Kraków, Poland), jaskula@chemia.uj.edu.pl
Frolov Anatoliy Valer'evich, Student, Penza State University (40 Krasnaya street, Penza, Russia), ji-di96@yandex.ru

Index UDK

546 766

DOI

10.21685/2307-9150-2016-2-5

Abstract

Background. Solutions of chromates and dichromats are widely used in analyti-cal chemistry and electroplating. Thus, the study of equilibrium of the reaction of transition of a chromate ion into a dichromate ion is of both theoretical and practical interests.
Results. The joint solution of the equations for calculating the equilibrium con-stants for the reactions of transition of a chromate ion into a dichromate ion and the equations of material balance of chromium ions in the solution leads to an equation for calculating the relative share of chromate ions in the solution depending on the initial concentration and the pH of the solution.
Conclusions. The obtained equation is consistent with the known literature, and certain difference from the experimental values may be due to the inaccuracy of the values of the equilibrium consta.

Key words

chromate ion, dichromate ion, solution’s pH.

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Дата создания: 28.10.2016 08:57
Дата обновления: 28.10.2016 09:45