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
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).