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G. Bandyopadhyay, Sujit Chandra Lahiri
Studies on Thermodynamic Dissociation Constants of 2,2´-Bipyridine, or 1,10-Phenanthroline in Acetone + Water Mixtures and Gibbs Energy of Transfer of the Hydrogen Ion from Water to Acetone + Water Mixtures
The thermodyamic dissociation constants for isoelectric reaction of the type LH+ ⇔ L + H+ (where L = 2,2´-bipyridine or 1,10-phenanthroline) have been determined pH-metrically at 298 K in acetone + water mixtures (0-90% of acetone). The pK-values were found to pass through a minimum at about 64-74 Wt% of acetone and then increase. The data are utilized to calculate the Gibbs energies of transfer of the H+ ion from water to acetone + water mixtures from which inferences have been made regarding structural variations and solvent basicity of aquo-organic mixtures.
Attempts have been made to understand the basicity and structural properties of acetone + water mixtures from a comparative study of ΔG0t(H+) profiles, excess relative permittivity εEr(X) and excess Gibbs energy profiles. Acetone has been found to structure forming over the whole composition range and structure formation is maximum in the region 60-70 Wt% of acetone.
Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0942-9352
Volume: 215, 01/2001
Pages: 037