A new three-particle-interaction model to predict the thermodynamic properties of different electrolytes

• In this study, Guggenheim charging process, which involves the radial Boltzmann distribution, was introduced to develop a new predictive model with three parameters, ion-ion distance parameter, ion-solvent parameter, and solvation parameter. In this model, the ion-ion and ion-solvent molecule interaction are all included in the charging process, and it is independent of the temperature and solvent. This new model was applied to correlate the experimental data from literatures for 208 electrolytes aqueous solution at T = 298.15 K of which the concentration range is wide. The calculated results agreed well with the experimental ones for most electrolytes, especially for the prediction in high ionic strength. The estimation of solvation parameter S also gave that the solvation tendency for cations and anions follow a trend, which is in consistent with results published in literature. Investigations were also been made in calculations for electrolytes solutions at other temperatures and non-aqueous system, which proved this model was also feasible.

Nyckelord

activity coefficient

osmotic coefficient

thermodynamic model

electrolyte solution

solvation

bi-univalent compounds

ion interaction parameters

rare-earth perchlorates

local composition model

excess gibbs energy

activity-coefficients

aqueous-solutions

osmotic coefficients

isopiestic determination

evaluated activity

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