Ion-Solvent Interactions and Determination of Single-Ion Gibbs Energies of Transfer from the Studies of the Solubility and Dissociation Constants of Oxalic Acid in Aquo + Methanolic Mixtures
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| 024 | 7 | 0 | |a 10.1524/zpch.217.11.1341.20486 |2 doi |
| 035 | |a (NATIONALLICENCE)gruyter-10.1524/zpch.217.11.1341.20486 | ||
| 245 | 0 | 0 | |a Ion-Solvent Interactions and Determination of Single-Ion Gibbs Energies of Transfer from the Studies of the Solubility and Dissociation Constants of Oxalic Acid in Aquo + Methanolic Mixtures |h [Elektronische Daten] |c [S. K. Gumtya, S. C. Lahiri] |
| 520 | 3 | |a The solvent effects on the dissociation of the simplest dibasic organic acid were examined from the determination of the first and second dissociation constants of oxalic acid conductometrically and pH-metrically in water + methanol mixtures (0-87 wt% of methanol). The solubility values of oxalic acid and potassium hydrogen oxalate were also determined in water + methanol mixtures. The dissociation constant and the solubility values were used to calculate the Gibbs energies of transfer ΔG0t of oxalic acid (H2OX), bioxalate (HOX−), oxalate (OX2−) and potassium (K+) ions from water to aquo-methanolic mixtures. These represent the quantitative measures of solute or ionsolvent interactions of the respective species in going from water to methanol + water mixtures. pK1, pK2 and the solubility values of oxalic acid increase continuously with increase in organic co-solvent. ΔG0t(H2OX) and ΔG0t(H+) are negative i.e. favourable but ΔG0t(H2OX), ΔG0t(OX2−) and ΔG0t(K+) are in general positive and hence unfavourable for the dissociation processes. The increase in basicity fecilitated the dissociation processes but decrease in dielectric constant and H-bonding capability enhance the association processes as the organic co-solvent increases. Attempts have been made to understand the solvation processes in terms of the structure of the aquo + organic mixtures and Walden products. The pK values can be suitably utilised to prepare buffer solutions in methanol + water mixtures. The solvent effect and solvation phenomena can be better understood from the collection of single-ion values of transfer. These may be utilised to calculate the solubilities of electrolytes in methanol + water mixtures. | |
| 540 | |a © 2003 Oldenbourg Wissenschaftsverlag GmbH | ||
| 690 | 7 | |a Thermodynamics & statistical physics |2 nationallicence | |
| 690 | 7 | |a Laboratory techniques, experiments |2 nationallicence | |
| 690 | 7 | |a Physical chemistry |2 nationallicence | |
| 700 | 1 | |a Gumtya |D S. K. |4 aut | |
| 700 | 1 | |a Lahiri |D S. C. |4 aut | |
| 773 | 0 | |t Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics |d Oldenbourg Wissenschaftsverlag GmbH |g 217/11/2003(2003-11-01), 1341-1360 |x 0044-3336 |q 217:11/2003<1341 |1 2003 |2 217 |o zpch | |
| 856 | 4 | 0 | |u https://doi.org/10.1524/zpch.217.11.1341.20486 |q text/html |z Onlinezugriff via DOI |
| 908 | |D 1 |a research article |2 jats | ||
| 950 | |B NATIONALLICENCE |P 856 |E 40 |u https://doi.org/10.1524/zpch.217.11.1341.20486 |q text/html |z Onlinezugriff via DOI | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Gumtya |D S. K. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Lahiri |D S. C. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 773 |E 0- |t Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics |d Oldenbourg Wissenschaftsverlag GmbH |g 217/11/2003(2003-11-01), 1341-1360 |x 0044-3336 |q 217:11/2003<1341 |1 2003 |2 217 |o zpch | ||
| 900 | 7 | |b CC0 |u http://creativecommons.org/publicdomain/zero/1.0 |2 nationallicence | |
| 898 | |a BK010053 |b XK010053 |c XK010000 | ||
| 949 | |B NATIONALLICENCE |F NATIONALLICENCE |b NL-gruyter | ||