Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 11    No. 3    June 2001

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Modeling of thermodynamic properties of
multi-component electrolyte solutions
FANG Zheng(方  正)1,  FANG Yuan(方  圆)2
ZHANG Quan-ru(张全茹)1,  LI Yuan-gao(李元高)1

1. College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, P.R.China;
2. College of Chemistry and Chemical Engineering,
Hunan University, Changsha 410082, P.R.China

Abstract:  An empiric equation, GH2Oex/(1-x(H2O))2=α+β·x(H2O)/ln(x(H2O)), representing the relation between the excess free energy GH2Oex and mole fraction of water x(H2O) in binary electrolyte solution, was developed and the parameters α and β in the equation were determined by fitting the experimental data for some binary aqueous systems of electrolytes such as CuCl2, NiCl2, HCl, NaCl, KCl, CaCl2 and BaCl2. The activities of water in such ternary and   multi-component systems composed of 7 binaries as HCl-H2O-CuCl2, HCl-H2O-NiCl2, HCl-H2O-NaCl, NaCl- H2O-KCl, NaCl- H2O-CaCl2, KCl-H2O-CaCl2, NaCl-H2O-BaCl2, KCl-H2O-CaCl2 and NaCl-H2O-KCl-BaCl2 were predicted by a simplified sub-regular solution model developed by authors from the corresponding binary systems. The predicted results are in good agreement with the measured ones.


Key words:   activity; electrolyte; solution; model; interchange energy

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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