Solution calorimetry as a method for estimation of enthalpy of mixing of binary mixtures

Abstract

The work is devoted to developing an approach for estimating the enthalpy of mixing using the classical dissolution calorimetry at infinite dilution method at 298.15 K. The approach is based on the solution enthalpies of binary mixtures (A₁A₂) and their pure (A₁ and A₂) components in an inert solvent (S) medium at infinite dilution. Two systems, n-heptane– chloroform and acetone–chloroform, with different proportions of components, were used to test the proposed approach. The solution enthalpies were measured for the studied binary mixtures in a cyclohexane medium at infinite dilution at 298.15 K. It has been found that the obtained values of mixing enthalpies obtained using the proposed approach are comparable to those reported in the literature values within the measurement error. This approach has considerable perspectives for the determination of mixing enthalpies of more complex systems.