The isopiestic method was used to determine osmotic coefficients of binary Na2Cr2O7(aq) solutions of concentrations 0.6777-3.8792 mol kg-1 at 25 °C. The concentration of a saturated binary solution Na2Cr2O7(aq) at 25 °C was determined. The Pitzer ion-interaction model has been used for thermodynamic analysis of the results obtained. Optimum values of the binary parameters of interionic interaction have been calculated and important thermodynamic characteristics of Na2Cr2O7·2 H2O determined.
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