Thermodynamic properties such as excess free volume, excess internal pressure, excess isother-mal compressibility, and partial molar volumes of binary mixtures of bis(2-methoxye-thyl)ether+ methyl acetate, + ethyl acetate, + n-butyl acetate, + methyl benzoate, + ethyl benzoate, + methyl salicylate and + diethyl succinate have been studied over the entire mole fraction range at 298.15 K. A mathematical relation for the calculation of excess free volume Vr, partial molar volumes V;, excess

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... l pressure Pf, and excess isothermal compressibility, fJfJ for the binary mixtures of bis(2-methoxyethyl}ether with methyl acetate, ethyl acetate, n-butyl acetate, methyl benzoate,' ethyl benzoate, methyl salicylate, and diethyl suc-cinate has been presented over the entire range of mixture composition. The results are discussed in terms of the strength of binary interactions. Experimental Procedure Bis(2-methoxyethyl)ether (digol) (B.D.H.), methyl benzoate (MB) (Naarden) and diethyl succi-nate (DES) (Riedel) were used as such. Methyl acetate (MA), n-butyl acetate (n-BA), methyl sali-cylate (MS), ethyl acetate (EA), and ethyl benzo-ate (EB) were purified by the recommended methods-'. The purity of these solvents was ascertained by comparing their density and refrac-tive index at 298.15 K which agreed reasonably with the literature values 1-3. Mixtures were prepared by mixing the appropriate volumes of liquid in specially designed ground glass stoppered air tight bottles and weighed in a single-pan Mettler balance to an accuracy of ± 0.01 mg. The possible error in the mole fractions is estimated to be around ±O.OOOI. Densities p, of pure liquids and their binary mixtures, refractive indices nD' for the sodium-D line and the speeds of sound u; were measured as reported earlier":". The isentropic compressibilit-ies were calculated as: fJs = 1/u 2 p.