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Thermodynamic study of aqueous sodium and potassium chloride and chromate systems at the temperature 298.15 K

✍ Scribed by Christomir Christov; Kalina Ivanova; Snejana Velikova; Stefan Tanev

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 101 KB
Volume: 34
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2002.0965

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✦ Synopsis

The solubilities of (m 1 NaCl + m 2 Na 2 CrO 4 )(aq) and (m 1 KCl + m 2 K 2 CrO 4 )(aq) where m denotes molality have been investigated at the temperature T = 298.15 K by the physico-chemical analysis method. Only the crystallization of the simple salts NaCl, Na 2 CrO 4 •4H 2 O, KCl, and K 2 CrO 4 have been established. The ternary solutions have been simulated thermodynamically at T = 298.15 K using the Pitzer model. The necessary thermodynamic parameters (binary and ternary ion-interaction parameters, thermodynamic solubility products) have been calculated and the theoretical solubility isotherms plotted. A very good agreement is found between calculated and experimental solubility isotherms. The standard molar Gibbs energies of formation r G o m of solid phases crystallizing in the systems under consideration have been estimated from theory.

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