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Thermodynamics of Salicylic and Sulpho-salicylic Acids in Ethanol-water at 25 °C

Salicylic and sulpho-salicylic acids are familiar complexing agents. They have been used by various workers as analytical reagents in colorimetric estimation of ferric iron. The thermodynamic dissociation constants of these ligands in aqueous medium have been determined. VASILEV [ 1 ] et al. calculated AH for the dissociation of saliyclic acid from the temperature coefficient of the dissociation constant and reported a value of 450 ± 300 cal/mole. The influence of solvent on the thermodynamic parameters, like AG, AH and AS is intriguing and interesting. It is only in recent years in the study of electrolytic equilibria in mixed solvents has gained considerable interest. Such studies are likely to throw light on the ion-solvent interactions as well as on the contrasting effect of the medium on the dissociation of acids and bases of different charge type. In the present work, the heats of dissociation of salicylic and sulpho-salicylic acids have been determined by calorimetry in ethanol-water media at 2 5 ° C .