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 2 O) 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.