Thermodynamics of Selected Aqueous Rare-Earth Elements Containing Triflate Salts at T=(288.15, 298.15, 313.15 and 328.15) K and p=0.1 MPa

Densities and Apparent Molar Volumes of Aqueous Solutions of Sodium and Potassium Triflates up to High Concentrations at Temperatures 293.15–343.15 K

“…As mentioned above, no volumetric data for KTf(aq) appear to have been reported in the literature, so no comparisons are possible for these solutions. For NaTf(aq), it should be noted that Erickson et al 12 rounded their V ϕ (NaTf) values to whole numbers. Fortunately, their reported density differences allowed the calculation of V ϕ with greater resolution.…”

“…The literature data for NaTf­(aq) − are summarized in Table but to the best of our knowledge, no volumetric data have been reported for KTf­(aq). For NaTf­(aq), there are two independent studies that cover unusually wide ranges of temperature (300 ≲ T /K ≲600) and pressure (0.1 ≲ p /MPa ≲ 28).…”

Standard molar volumes and heat capacities of aqueous solutions of sodium trifluoromethanesulfonate at temperatures up to 573K and pressures to 28MPa

“…It is apparent that the agreement can be considered as quite reasonable, within the claimed uncertainty of our values. The low temperature data at atmospheric pressure published recently by Erickson et al [7] should be also mentioned. Their values of standard molar volumes are 74.1, 76.3, and 77.6 cm 3 Á mol À1 at 298.15, 313.15, and 328.15 K, respectively, yet the comparison with our data can be only semiquantitative since they were not obtained at quite identical temperature and /or pressure.…”

“…They are somewhat lower compared to our measurements: 193.6, 206.3 and 202.1 J Á K À1 Á mol À1 at 298, 313 and 328 K, respectively. Quite recently Erickson et al[7] reported for C o p at the same conditions the values 194.7, 203.6 and 212.0 J Á K À1 Á mol À1 .4. Standard molar volumes and heat capacities of triflate anion…”

“…Xiao et al [6] measured heat capacities for aqueous solutions of sodium triflate using a Sodev CP-C flow microcalorimeter at 283, 298, 313 and 328 K, at 0.1 MPa, for molalities from 0.05 to 1.6 mol Á kg À1 . Erickson et al [7] have published recently new data for densities and heat capacities at near ambient temperatures (288, 298, 313, and 328 K) and pressure of 0.1 MPa using a Sodev O2D densitometer and Picker flow microcalorimeter, respectively. In all three papers the experimental data were extrapolated to infinite dilution for obtaining the standard molar volumes and heat capacities of sodium triflate and for calculating the properties of the triflate anion at near ambient conditions that were compared with the data for triflic acid.…”