Thermodynamic study of (m1Cs2SeO4 + m2NiSeO4)(aq)wheremdenotes molality atT = 298.15 K |
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| Institution: | 1. Dept. of Graphic Design and Engineering Projects, Bilbao Faculty of Engineering, University of the Basque Country (UPV/EHU), Spain;2. Macromolecular Chemistry Research Group (LABQUIMAC), Dept. of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Spain |
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| Abstract: | The isopiestic method has been used to determine the osmotic coefficients of the binary solutions Cs2SeO4(aq) at T = 298.15 K from (1.090 to 4.591)mol · kg ? 1. The molalities m of (m1Cs2SeO4 + m2NiSeO4)(aq) have been investigated by physicochemical analysis. The crystallization of a new double salt Cs2SeO4· NiSeO4· 6H2O has been established. The Pitzer ion-interaction model has been used for thermodynamic analysis of the results obtained. The thermodynamic data needed (binary and ternary parameters of ionic interaction, thermodynamic solubility products) have been calculated and the theoretical solubility isotherm has been plotted. The experimentally obtained and the calculated solubilities are in very good agreement. The standard molar Gibbs energy of the synthesis reaction ΔrGmoof the double salt Cs2SeO4· NiSeO4· 6H2O from the corresponding simple salts Cs2SeO4and NiSeO4· 6H2O, as well as the standard molar Gibbs energy of formation ΔrGmohave been determined. |
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