The model representation of electrolyte solutions with two-component solvents and mass spectrographic determination of enthalpy change at solvation of Na +Et m(H 2O) n ion clusters by ethanol molecules in water–ethanol solvent

Abstract

Considering liquid as a set of potential wells (Frenkel's conception), the experimental distribution of sodium ions with respect to a degree of solvation with water and ethanol molecules in water–ethanol solvent can be satisfactorily described by a polynomial ( p a + p b + q) k ( p a and p b are the probabilities of occupancy of one of the k equivalent potential wells near the ion by a water or an ethanol molecule, respectively; q=1− p a − p b ). Basing on the mass spectrographic data, it is shown that values of enthalpy changes, ΔH m, m+ f , for 50 reactions of solvation of ion clusters Na +Et m (H 2O) n with f ethanol molecules in solution ( f=1,2,…,5) are satisfactorily described by the dependence (− ΔH)= C( n, f)exp[− α( n) m] for most reactions.