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Thermodynamic study of (m1Cs2SeO4 + m2NiSeO4)(aq)wheremdenotes molality atT =  298.15 K

✍ Scribed by Dimitar Barkov; Christomir Christov; Todora Ojkova

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
99 KB
Volume
33
Category
Article
ISSN
0021-9614

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✦ Synopsis

The isopiestic method has been used to determine the osmotic coefficients of the binary solutions Cs 2 SeO 4 (aq) at T = 298.15 K from (1.090 to 4.591) mol β€’ kg -1 . The molalities m of (m 1 Cs 2 SeO 4 + m 2 NiSeO 4 )(aq) have been investigated by physicochemical analysis. The crystallization of a new double salt Cs 2 SeO 4 β€’ NiSeO 4 β€’ 6H 2 O 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 r G o m of the double salt Cs 2 SeO 4 β€’ NiSeO 4 β€’ 6H 2 O from the corresponding simple salts Cs 2 SeO 4 and NiSeO 4 β€’ 6H 2 O, as well as the standard molar Gibbs energy of formation r G o m have been determined.

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