Osmotic coefficients of some aqueous sodium chloride solutions at high temperature

Abstract

The vapour pressure of 1 m sodium chloride solution has been remeasured, and 0.5 m sodium chloride has been measured relative to water to obtain osmotic coefficients φ from 125 to 270°C. The data obtained have been fitted, in conjunction with those previously obtained, to an extended Debye-Hückel equation. Activity coefficients, relative partial molal enthalpies and relative partial molal heat capacities have been calculated at 1, 2 and 3 m over the temperature range 60–270°C.