Development of a Model for Electrostatic Contribution to the Osmotic Coefficient of Aqueous Electrolytes

This work is the extension of our previous work [Fluid Phase Equil. 2018, 460, 57; Data in Brief 2018, 19, 485]. In this work, a predictive model has been developed for the electrostatic interaction which is based on the cell model. In this model, there are three regions around the central ion. Owing to the presence of a very high electric field (approximately 10¹⁰ V·m–¹) around the central ion, water molecules are highly oriented toward the central ion and have the dielectric constant less than the dielectric constant of water in the second region (partially oriented water molecules). The third region contains the water molecules with a dielectric constant as bulk water. The electrostatic interaction, computed by the cell model, is compared with the measured electrostatic interaction in our previous work, and a good match was found between them.