THERMODYNAMICS OF BINARY-MIXTURES OF NONELECTROLYTES CONTAINING A SALT

Molar excess volume V(E) and enthalpy H(E) data have been measured at 25-degrees-C for pyridine A saturated with anhydrous cupric chloride (S) [A(S)] + B [where B is aniline or o-toluidine (OT) or formamide (FD) or N,N-dimethylformamide (NND)] mixtures on the assumption that while the standard state of B is that of pure component B, the standard state of A(S) is that of A saturated with the salt S. The excess volume or enthalpy data for an equimolar mixture at a given temperature have been utilized to evaluate the interactional parameter chi-12 of the Sanchez and Lacombe theory of fluid mixtures at that temperature, and the same has been combined with V(E)(x(A)) data for a good prediction not only of the corresponding H(E)(x(A)) data for the mixture but also the extent of unlike interactions between the A(S) and B components of these A(S) + B mixtures.