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Thermodynamic study of the co-crystallization of 2RbCl·NiCl2·2H2O and 2RbCl·MnCl2·2H2O, at the temperature 298.15 K

✍ Scribed by Christomir Christov

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
354 KB
Volume
28
Category
Article
ISSN
0021-9614

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✦ Synopsis

The molalities m of (m12RbCl•NiCl2•2H2O + m22RbCl•MnCl2•2H2O) (aq) have been investigated at the temperature T=298.15 K and formation of a continuous series of mixed crystals has been found. On the basis of the present and earlier experimental data it has been established that the formation of a continuous mixed crystal series of isostructural double salts 2MCl•MeCl2•2H2O depends on the close values of the unit cell parameters. The basic Pitzer ion-interaction model has been used for the first time for determining the thermodynamic characteristics of the formation process of mixed crystals of double salts. The component activities of the saturated ternary solution (m12RbCl

and in the mixed crystalline phase are determined and the change of the molar Gibbs energy of mixing DmixGm of crystals is determined depending on the solid phase composition given in mole fractions. It is established that at T=298.15 K the mixed 2RbCl•(Ni, Mn)Cl2•2H2O crystals show positive deviations from the ideal mixed crystals. Using the regular mixing model, the results obtained can be summarized by the following equation: DmixGm = -x1x2•(3.3020.50) kJ•mol -1 .

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