Buchner, Richard and Capewell, Stephen G. and Hefter, Glenn and May, Peter M. (1999) Ion-pair and solvent relaxation processes in aqueous Na2SO4 solutions. JOURNAL OF PHYSICAL CHEMISTRY B, 103 (7). pp. 1185-1192. ISSN 1089-5647,
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The complex dielectric permittivity of aqueous sodium sulfate solutions (0.025 less than or equal to c/mol dm(-3) less than or equal to 1.6) has been determined in the frequency range 0.2 less than or equal to v/GHz less than or equal to 20 with a commercial dielectric measurement system based on a vector network analyzer. The spectra were supplemented with interpolated literature data at 12 less than or equal to v/GHz less than or equal to 89. To fit the complex permittivity spectra, a superposition of three Debye relaxation processes was necessary. The slow and intermediate dispersion steps are assigned to the tumbling motion of doubly solvent-separated (2SIP) and solvent-shared (SSIP) NaSO4- ion pairs, respectively. The fast process, of amplitude S-3, is due to the collective relaxation of the solvent. Effective solvation numbers were deduced from the effect of Na2SO4 concentration on S-3. From the ion-pair dispersion amplitudes, S-1 and S-2, the concentrations c(2SIP) and c(SSIP), and thus the overall stoichiometric stability constant, beta(NaSO4-), were determined.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTROLYTE-SOLUTIONS; DIELECTRIC-RELAXATION; FRICTION; THERMODYNAMICS; DISPERSION; DYNAMICS; LIQUIDS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Nov 2022 15:47 |
| Last Modified: | 15 Nov 2022 15:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48515 |
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