Abstract
The Pitzer ion-interaction model has been used for thermodynamic simulation of the ternary NaClNa 2Cr 2O 7H 2O and Na 2SO 4Na 2Cr 2O 7H 2O, and the quaternary NaClNa 2SO 4-Na 2Cr 2O 7-H 2O systems at T=298.15 K. The necessary thermodynamic functions (binary and ternary parameters of interionic interaction and thermodynamic solubility products) have been calculated and the theoretical solubility isotherms have been plotted. Good agreement between experimentally determined and calculated solubilites has been found.
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