Zusammenfassung
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 ...
Zusammenfassung
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.
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