Gibbs Energy of Transfer of H+ Ion from Water to Urea-Water Mixtures
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B.P. Dey
The thermodynamic dissociation constants for the isoelectronic reaction LH+ ↔ L + H+ [Eq. (1)], (where L = 1,10-phenanthroline or 2,2´-bipyridine) have been determined pH-metrically in urea + water mixtures (0-8 M urea). The data have been utilized to calculate the Gibbs energies of transfer of H+ from water to urea + water mixtures. ΔG0t(H+) values have been found to be increasingly negative. The results indicate the increase in basicity of the urea + water mixtures resulting from the breakdown of water structure by urea. The dissociation constants for the reaction UH+ ↔ U + H+ [Eq. (2)] have also been determined. The variation of the dissociation constant UH+ can be properly correlated with the variation of dielectric constants of the urea + water mixtures. A good correlation exists between the variation of basicity of the solvent mixtures and the dissociation constants of uronic acid.
Articles in the same Issue
- Gibbs Energies of Transfer of Hydrogen Ion from Water to Tetrahydrofuran + Water Mixtures and Basicity and Structuredness of Aquo-ethers
- Gibbs Energy of Transfer of H+ Ion from Water to Urea-Water Mixtures
- Calculation of Gibbs Energies of Hydration of Monovalent Ions: Examination of Born Equation and its Reevaluation
- Comparative Studies on the Complex-Formation Equilibria of Mercury(II) with Acetylcysteine and Captopril
- Thermal Diffusion of Weak Electrolytes III. The Soret Coefficients of Normal Carboxylic Acids
- Nonlinear Vibrations in a 2-Dimensional Protein Cluster Model with Linear Bonds
- Electrodeposition of CdSe Films: In-Situ Study by Spectroscopic Ellipsometry
- Elementary Reaction of CF2(X~) with O3: Primary Products
- High-Temperature Carbon Particle Formation and Decay in Carbon Suboxide Pyrolysis behind Shock Waves
Articles in the same Issue
- Gibbs Energies of Transfer of Hydrogen Ion from Water to Tetrahydrofuran + Water Mixtures and Basicity and Structuredness of Aquo-ethers
- Gibbs Energy of Transfer of H+ Ion from Water to Urea-Water Mixtures
- Calculation of Gibbs Energies of Hydration of Monovalent Ions: Examination of Born Equation and its Reevaluation
- Comparative Studies on the Complex-Formation Equilibria of Mercury(II) with Acetylcysteine and Captopril
- Thermal Diffusion of Weak Electrolytes III. The Soret Coefficients of Normal Carboxylic Acids
- Nonlinear Vibrations in a 2-Dimensional Protein Cluster Model with Linear Bonds
- Electrodeposition of CdSe Films: In-Situ Study by Spectroscopic Ellipsometry
- Elementary Reaction of CF2(X~) with O3: Primary Products
- High-Temperature Carbon Particle Formation and Decay in Carbon Suboxide Pyrolysis behind Shock Waves
