화학공학소재연구정보센터
Journal of Chemical and Engineering Data, Vol.63, No.9, 3545-3550, 2018
Thermodynamic Properties of Aqueous-Mixed Electrolyte Solutions of {y Na2SO4 + (1-y) K2SO4} (aq)
Hygrometric measurements were made for {y Na2SO4 + (1 - y) K2SO4}(aq) solutions for different ionic-strength fractions of Na2SO4 with y = 0.2, 0.5, and 0.8 at 298.15 K and from total molalities of 0.2 mol.kg(-1) to about the saturation of one of the solutes. From the experimental results, the osmotic coefficients are determined for different compositions of this system. The new Pitzer mixing ionic parameters are also calculated and used to predict the solute activity coefficients in this ternary solution. These results allow for the calculation of the excess Gibbs energy at total molalities for ionic-strength fractions y.