Apparent and partial ideal molar isentropic compressibilities of binary liquid mixtures Electronic Supplementary Information available. See http://www.rsc.org/suppdata/cp/b1/b104974g/

The excess apparent molar isentropic compressibilities of binary liquid mixtures, which are derived from ultrasonic speed measurements, are frequently used to probe the macroscopic effects of intermolecular forces. The composition dependence of the apparent and partial molar isentropic compressibilities of components of ideal mixtures is explored, with special interest being shown in the infinite aqueous dilution limit. Attention is also paid to convenient methods for estimating the effects of solvation and of cosphere overlap in water-rich mixtures. In particular, it is shown that the difference between excess partial molar and excess apparent molar isentropic compressibilities gives a strong indication of the magnitudes of the effects of solute–solute interactions.

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