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Xiao, Caibin; Pham, Tram N. Q.; Xie, Wei; Tremaine, Peter R.

doi:10.1023/a:1005230514566

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…Differences between the two salts are also evident in plots (Figures and ) of V ϕ against molality (√ m ), with V ϕ (LiTf) showing a most unusual “kink” at m ≈ 1 mol·kg –1 that becomes more apparent at lower temperatures while V ϕ (Li 2 SO 4 ) increases monotonically with increasing m at all temperatures. Similar unusual dependences of V ϕ on molality have been observed for other triflate salts and have been attributed to the formation of hydrate-like structures. , …”

Section: Resultsmentioning

confidence: 51%

Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K

Hnědkovský

Hefter

2016

J. Chem. Eng. Data

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Densities of aqueous solutions of lithium sulfate (Li 2 SO 4 ) and lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) at solute molalities ranging from 0.05 to 2.7 or 9.6 mol•kg −1 , respectively, have been measured by vibrating-tube densimetry over the temperature range 293.15 ≤ T/K ≤ 343.15 at 0.1 MPa pressure. The apparent molar volumes (V ϕ ) of Li 2 SO 4 (aq) and LiCF 3 SO 3 (aq) derived from these data were fitted using an extended Redlich−Rosenfeld−Meyer equation. The V ϕ values for the two systems exhibit quite different dependences on concentration and temperature, as do the isobaric expansibilities. A combination of the present and literature data reveals that the densities for Li 2 SO 4 (aq) given in standard compilations are unreliable at low concentrations. Comparison of the present results with literature data for related salts shows that V ϕ (Li n X) and V ϕ (Na n X) exhibit a crossover at ≈0.5 mol•kg −1 for both systems, similar to those observed previously for other lithium and sodium salts. Consideration of an appropriate series of lithium salts suggests that anion size influences departures from the Debye−Huckel limiting law for volumes, whereas for a series of sulfate salts cation size does not appear to be a major factor.

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Section: Resultsmentioning

confidence: 51%

Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K

Hnědkovský

Hefter

2016

J. Chem. Eng. Data

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“…Apparent molar heat capacities of aqueous, LiCF 3 SO 3 (●, this work), NaCF 3 SO 3 (blue ◆), and HCF 3 SO 3 (red ■) at 298.15 K as a function of concentration (√ m ) at T = 298.15 K and p = 0.1 MPa.…”

Section: Resultsmentioning

confidence: 58%

“…Column 2 of Table gives the relevant single ion molar heat capacities recommended by Marcus, based on the widely accepted tetraphenylphosphonium tetraphenylborate (TPTB) extra-thermodynamic assumption . The value for C p,ϕ o (Tf – ) was obtained as the average of the C p,ϕ o values reported by Tremaine et al for NaTf(aq) and HTf(aq) combined with Marcus’s single ion values for Na + (aq) and H + (aq)…”

Section: Resultsmentioning

confidence: 99%

Heat Capacities of Aqueous Solutions of Lithium Sulfate, Lithium Perchlorate, and Lithium Trifluoromethanesulfonate at 298.15 K

Hnědkovský

Hefter

2016

J. Chem. Eng. Data

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Isobaric heat capacities of aqueous solutions of Li 2 SO 4 , LiClO 4 , and LiCF 3 SO 3 have been measured at 298.15 K and 0.1 MPa up to high concentrations using a Picker flow calorimeter. Apparent molar isobaric heat capacities, C p,ϕ , derived from these data were fitted within the limits of experimental precision with an extended Redlich−Rosenfeld−Meyer type of equation, which was also used to estimate the standard state (infinite dilution) quantities, C p,ϕ o , for each salt. The latter values were combined with appropriate literature data to produce a robust estimate of C p,ϕ oWhere comparison was possible, C p,ϕ (Li n X) values were closely parallel to those of the corresponding acids over the whole concentration range, even when the shapes of the curves were highly unusual. In contrast, C p,ϕ (Na n X) values always exhibited a crossover with the lithium salt data at a concentration of about 1 mol•kg −1 , which appears to reflect differences in the hydration of the two cations.

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“…They used a vibrating tube flow densimeter SODEV 03D [5] at temperatures up to 328 K and pressure of 0.1 MPa, and a customized platinum vibrating tube densitometer at temperatures from 323 K and at higher pressures. 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.…”

Section: Introductionmentioning

confidence: 99%

“…[6] are plotted infigure 5. 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.…”

mentioning

confidence: 99%

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

Pourtier¹,

Ballerat‐Busserolles²,

Majer³

et al. 2013

The Journal of Chemical Thermodynamics

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Untitled

Cited by 12 publications

References 17 publications

Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K

Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K

Heat Capacities of Aqueous Solutions of Lithium Sulfate, Lithium Perchlorate, and Lithium Trifluoromethanesulfonate at 298.15 K

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

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Untitled

Cited by 12 publications

References 17 publications

Densities and Apparent Molar Volumes of Aqueous Solutions of Li2SO4 and LiCF3SO3 at Temperatures from 293 to 343 K

Densities and Apparent Molar Volumes of Aqueous Solutions of Li2SO4 and LiCF3SO3 at Temperatures from 293 to 343 K

Heat Capacities of Aqueous Solutions of Lithium Sulfate, Lithium Perchlorate, and Lithium Trifluoromethanesulfonate at 298.15 K

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

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Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K

Densities and Apparent Molar Volumes of Aqueous Solutions of Li₂SO₄ and LiCF₃SO₃ at Temperatures from 293 to 343 K