, Volume 32, Issue 9, pp 791-802

Volumetric Properties of Aqueous 2-Chloroethanol Solutions and Volumes of Transfer of Some Amino Acids and Peptides from Water to Aqueous 2-Chloroethanol Solutions

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Densities and apparent molar volumes of aqueous 2-chloroethanol were determined at temperatures from 15.0 to 34.4°C using digital densimetry. The results of the volumetric measurements have been used to calculate the following thermodynamic quantites at 25°C: V 2 o = 55.05 ± 0.02 cm3-mol−1, (∂V 2 o/∂T)p = 0.01486 ± 0.00318 cm3-K−1-mol−1, and (∂2 V 2 o/∂T 2)p = 0.02972 ± 0.00318 cm3-K−2-mol−1. Partial molar volumes of transfer from water to 1 mol-dm−3 2-chloroethanol have also been determined for L-glycine, L-alanine, L-serine, L-glutamic acid, and L-aspartic acid at 35.0°C. The transfer results have been explained in terms of the nature of the interactions of the groups in the solute and solvent. Hydration numbers of L-glycine and L-alanine have also been calculated in aqueous 2-chloroethanol.