Solubility and solute-solvent interactions of dl-alanine and dl-serine in aqueous potassium nitrate solutions

Abstract

Present study described the saturated solubilities of dl-alanine and dl-serine in pure and aqueous binary potassium nitrate solutions, were estimated by an analytical ‘formol titration’ procedure at 298.15K. Various physicochemical and thermodynamical parameters like free energy change, density, molar volume, solvent diameter, co-solvent diameter, probable dipole moment of aqueous electrolyte systems, etc., were calculated at 298.15K. The nature and degree of solubilities of such amino acids in aqueous potassium nitrate solutions were analyzed in terms of salting-in effect which was further justified by relative solubility and salting-in constants. Finally, thermodynamics of solute-solvent interactions in terms of transfer Gibbs free energetics were calculated and described the relative stability of the amino acids in pure and binary mixture of solvents.