Calculation of the Density, Refractive Index, and Vapor Pressure of Nonelectrolyte Binary Solutions

The possibility of practical application of the model of nonelectrolyte solutions based on equilibrium processes of homo- and heteroassociation is considered. The calculated values of density, refractive index, and vapor pressure over the solution vs. the composition were found taking into account only symmetric solvation for solutions of binary mixtures, as well as solvation constants K, variations of molar volume (Δ V ), refractive index (Δ n ), and vapor pressure over solution (Δ P ) during solvation were determined. The density of binary mixtures as a function of their compositions were determined on the ground of data on the density of pure components, calculated solvation constants, and variation of the molar volume (Δ V ). The deviation between the calculated and experimental density values is 0.05–1.67%, depending on the composition of the binary mixture, which proves the possibility of practical application of the considered model of nonelectrolyte solutions.