Journal article
Dielectric relaxation of aqueous Na2CO3 solutions
Physical Chemistry Chemical Physics, Vol.1(8), pp.1933-1937
1999
Abstract
The complex dielectric permittivity of aqueous sodium carbonate solutions (0.05 ≤ c/mol L-1 ≤ 2.5) has been determined in the frequency range 0.2 ≤ v/GHz ≤ 20 at 25.0 °C with a commercial dielectric measurement system based on a vector network analyser. 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 separated (2SIP) and solvent-shared (SSIP) NaCO3-(aq) ion-pairs respectively. The absence of contact ion-pairs was confirmed by Raman spectroscopy. The fast process is assigned to the collective relaxation of the solvent. Equilibrium constants for the formation of NaCO3-(aq) were determined from the ion-pair dispersion amplitudes. The effect of Na2CO3 concentration on the water dispersion amplitude allowed effective solvation numbers to be deduced.
Details
- Title
- Dielectric relaxation of aqueous Na2CO3 solutions
- Authors/Creators
- S.G. Capewell (Author/Creator)R. Buchner (Author/Creator)G. Hefter (Author/Creator)P.M. May (Author/Creator)
- Publication Details
- Physical Chemistry Chemical Physics, Vol.1(8), pp.1933-1937
- Publisher
- Royal Society of Chemistry
- Identifiers
- 991005542560607891
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
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