Abstract
Densities, ultrasonic speeds and viscosities of l-alanine and l-phenylalanine in water and in 0.1mol·kg−1 aqueous citric acid solutions were measured over the temperature range (298.15 to 313.15)K with interval of 5K at atmospheric pressure. From these experimental data apparent molar volume, limiting apparent molar volume and the slope, partial molar expansibilities, adiabatic compressibility, transfer volume, Falkenhagen coefficient, Jone-Dole's coefficient, the temperature derivative of Jone-Dole's coefficient, intermolecular free length, specific acoustic impedance, and molar compressibility were calculated. The results are interpreted in terms of solute – solute and solute-solvent interactions in these systems. It has also been observed that l-alanine acts as a structure breaker whereas l-phenylalanine acts as a structure maker in aqueous citric acid.
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