Abstract
Apparent molar volumes and viscosities of glycine, DL-α-alanine and L-leucine in water and in 1.0 m (mol kg - 1 ) aqueous solutions of each of potassium chloride, barium chloride, glucose and sucrose have been determined from density and efflux time measurements, using vibrating-tube digital densitymeter and Ubbelohde viscometer, respectively at 298.15 K. Volume data were utilised to calculate partial molar volumes of transfer at infinite dilution (ν 0 2,tr) from water to mixed aqueous solutions and B-coefficients were calculated from viscosity data using Jones-Dole equation. Positive v 0 2,tr values have been rationalized using cosphere overlap model in terms of solute-cosolute interactions. Transfer B-coefficients of the amino acids studied are positive in case of glucose and sucrose whereas these are negative in case of electrolytes (KCI, BaCl 2 ) which have been explained in terms of changes in solvent structure. Contributions of the side chain to v 0 2,tr and to B-coefficient values have also been discussed.
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