Osmotic coefficients of aqueous NaCl and KCl solutions. Temperature–concentration behaviour of the Bahe lattice model

Abstract

An expression for the osmotic coefficient, ϕ, has been obtained in the context of the Bahe lattice model for electrolyte solutions. As a first application, the available osmotic coefficient data for aqueous NaCl and KCl solutions in the temperature range 0–100 °C have been analysed. The results show a good agreement with the behaviour predicted by the model up to molalities as high as 3.6–4 mol kg^–1 for the two salts over the whole temperature range.