Acid–base equilibria in aqueous solutions of meta-cresolsulfophthalein in the temperature range of 25 to 200°C


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Abstract

Values of the second thermodynamic ionization constant of pH indicator m-Cresol Purple are determined spectrophotometrically in slightly alkaline aqueous solutions in the temperature range of 25 to 200°C at saturated vapor pressure. Data required for studies on acid–base equilibria in weakly alkaline aqueous solution of rare-earth elements at elevated temperatures are obtained to characterize their behavior in geochemical systems.

About the authors

S. A. Stepanchikova

Institute of Geology and Mineralogy

Author for correspondence.
Email: step@igm.nsc.ru
Russian Federation, Novosibirsk, 630090

G. I. Galay

Institute of Geology and Mineralogy

Email: step@igm.nsc.ru
Russian Federation, Novosibirsk, 630090

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