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pH-Metric Determination of the Equilibrium Constants in Aqueous Heterogeneous Systems
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Author(s): Igor Povar (Institute of Chemistry, Moldova), Oxana Spinu (Institute of Chemistry, Moldova)and Alfonso Mucci (Department of Earth and Planetary Sciences, McGill University, Canada)
Copyright: 2022
Pages: 34
Source title:
Handbook of Research on Water Sciences and Society
Source Author(s)/Editor(s): Ashok Vaseashta (International Clean Water Institute, USA & Transylvania University of Brasov, Romania & Academy of Sciences of Moldova, Moldova), Gheorghe Duca (Institute of Chemistry, Moldova State University, Moldova & Academy of Science of Moldova and Romanian Academy, Romania.)and Sergey Travin (Federal Research Center for Chemical Physics and N. N. Semenov of the Russian Academy of Sciences, Russia)
DOI: 10.4018/978-1-7998-7356-3.ch010
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Abstract
In this chapter, original methods for determining thermodynamic properties such as the equilibrium activity product or solubility product of sparingly soluble compounds and the stability constants of complexes are described. Methods for determining concentration product and solubility are based solely on pH measurements of the saturated aqueous solutions for a known initial composition of the heterogeneous mixture and the equilibrium constants of an arbitrary set of possible side reactions in the solution. In the case of sparingly soluble acids or hydroxides, the determination of the solubility (Sol) and solubility product (KS) is also possible in the presence of other acids and bases of known concentrations. Sol and KS were calculated from known experimental pH data for a series of hydroxides, acids, neutral and acidic salts MmHxAy(S), as well as basic/mixed salts Mm(OH)xAy(S) of arbitrary composition.
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