Thermodynamic properties of aqueous potassium sulfate under superambient conditions

Using the ion-interaction or virial coefficient approach developed by Pitze r, the pressure dependencies of the osmotic and activity coefficients for K 2SO4(aq) up to 225 degrees C and 0.65 mol-kg(-1) have been calculated from recent literature data on the apparent molar volumes of K2SO4(aq). These pr essure dependencies were combined with the osmotic and activity coefficient s at 1 bar or P-sat, obtained from the model of Holmes and Mesmer to yield a comprehensive set of thermodynamic properties of K2SO4(aq) at temperature s from 25 to 225 degrees C, pressures 100, 200, and 300 bars, and molalitie s to 0.65 mol-kg(-1).