APPARENT MOLAR VOLUMES OF AQUEOUS SODIUM TRIFLUOROMETHANESULFONATE AND TRIFLUOROMETHANESULFONIC ACID FROM 283 K TO 600 K AND PRESSURES UP TO 20 MPA

Citation
Cb. Xiao et Pr. Tremaine, APPARENT MOLAR VOLUMES OF AQUEOUS SODIUM TRIFLUOROMETHANESULFONATE AND TRIFLUOROMETHANESULFONIC ACID FROM 283 K TO 600 K AND PRESSURES UP TO 20 MPA, Journal of solution chemistry, 26(3), 1997, pp. 277-294
Citations number
30
Categorie Soggetti
Chemistry Physical
ISSN journal
00959782
Volume
26
Issue
3
Year of publication
1997
Pages
277 - 294
Database
ISI
SICI code
0095-9782(1997)26:3<277:AMVOAS>2.0.ZU;2-C
Abstract
Relative densities of NaCF3SO3(aq) at molalities 0.073 less than or eq ual to m/(mol-kg(-1)) less than or equal to 1.68 were measured with vi brating-tube densimeters from 283 K to 600 K and from 0.1 MFa to 20 MP a. Relative densities of HCF3SO3(aq) at molalities 0.12 < m/(mol-kg(-1 )) < 2.1 were determined at temperatures from 283 K to 328 K at 0.1 MP a. Apparent molar volumes calculated from the measured densities were represented by the Fitter ion-interaction treatment. The temperature a nd pressure dependence of the standard partial molar volume and the se cond virial coefficients in the Fitter equation were expressed by empi rical expressions in which the compression coefficient of water and te mperature were used as independent variables. The conventional standar d partial molar volumes V-o(CF3SO3-, aq) from T = 283 K to 573 K were calculated from the experimental values for V-o(NaCF3SO3, aq) and know n values for V-o(Na+, aq). The values of V-o(CF3SO3-, aq) at temperatu res from 283 K to 328 K obtained from the values of V-o(NaCF3SO3, aq) and V-o(HCF3SO3, aq) agree to within 1.2 cm(3)-mol(-1).