The role of Debye charging in predicting activity coefficients in electrolyte solutionsстатья
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Аннотация:The role of Debye charging method in developing extended Debye–Hückel theories with concentration dependent solution permittivity is examined. It is shown that there are different charging methods giving accordingly different equations for the free energy of solutionand activity coefficients. They are named regular and extended Debye charging methods respectively. In the case of the extended Debye charging the ion–ion interaction term in the ionic activity coefficient takes the form of the original Debye–Hückel expression but with permittivity of pure solvent substituted by the concentration dependent permittivity of solution and the ion–water interaction (solvation) term reduces to the Born expression. The regular Debye charging leads to more cumbersome expressions for mean ionic activity coefficient. The capabilities of the two extended Debye–Hückel models to predict activity coefficients in aqueous solutions of alkali metal chlorides are compared.