Apparent Molar Volumes and Viscosities of Some Amino Acids in Aqueous Sodium Acetate Solutions at 298.15 K

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Abstract

Apparent molar volumes, V2,φ, and viscosities, η, of glycine, dl-α-alanine, dl-α-amino-n-butyric acid, l-leucine, and l-phenylalanine in water and in (0.5, 1.0, 2.0, 4.0, and 5.5) mol·kg-1 aqueous sodium acetate solutions have been determined at 298.15 K from densities and flow time measurements, respectively. The standard partial molar volumes, V∞2, obtained from V2,φ, have been used to calculate the corresponding volume of transfer at infinite dilution, ΔtV∞, from water to aqueous sodium acetate solutions. B coefficients have been calculated using the Jones−Dole equation. The side-chain contributions to V∞2 and B coefficients have been calculated. The comparison of ΔtV∞ values with the literature shows that the effect of the acetate ion follows the same order as in the Hofmeister series.

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