Vapor–Liquid Equilibria, Density and Speed of Sound of Aqueous potassium sodium tartrate Solutions at different temperatures

In this work, densities, speed of sound and water activities of equeous potassium sodium tartrate solutions at different temperatures and atmospheric pressure have been measured and to calculate accurate limiting apparent volumes, enough data were determined in the dilute region (below ۰.۱ mol. kg-۱). Sodium chloride were used as the isopietic standards for the calculation of activities. From the measurements of water activities by isopiestic methods, values of the vapor pressure of solutions were determined. The experimental water activities have been correlated successfully with the Pitzer equation. The experimental density and speed of sound data for potassium sodium tartrate were used to obtain apparent molar volume values at T= (۲۹۸.۱۵, ۳۰۸.۱۵, and ۳۱۸.۱۵) K, and these data were satisfactorily fitted to the Pitzer equation.

کلیدواژه ها:

density ، water activity ، speed of sound ، isopiestic.