Capewell, S.G. and Buchner, Richard and Hefter, Glenn and May, P.M. (1999) Dielectric relaxation of aqueous Na2CO3 solutions. Physical Chemistry Chemical Physics 1 (8), pp. 1933-1937.
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The complex dielec. permittivity of aq. sodium carbonate solns. (0.05≤c/mol L-1≤2.5) has been detd. in the frequency range 0.2≤ν/GHz≤20 at 25.0°C with a com. dielec. measurement system based on a vector network analyzer. A superposition of three Debye relaxation processes was necessary to fit the complex permittivity spectra. The slow and intermediate dispersion steps are assigned to double solvent sepd. (2SIP) and solvent-shared (SSIP) NaCO3-(aq) ion-pairs resp. The absence of contact ion-pairs was confirmed by Raman spectroscopy. The fast process is assigned to the collective relaxation of the solvent. Equil. consts. for the formation of NaCO3-(aq) were detd. from the ion-pair dispersion amplitudes. The effect of Na2CO3 concn. on the water dispersion amplitude allowed effective solvation nos. to be deduced.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dielec relaxation aq sodium carbonate soln|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||14 Jun 2012 12:45|
|Last Modified:||14 Jun 2012 12:45|