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

Apparent molar volumes, V 2, 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 V 2, φ, have been used to calculate the corresponding volume of transfer at infinite dilution, Δ t V ∞, 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 Δ t V ∞ values with the literature shows that the effect of the acetate ion follows the same order as in the Hofmeister series.