Densities of aqueous solutions of lithium sulfate (Li2SO4) at solute molalities ranging from 0.05 to 2.7 mol*kg 1 have been measured by vibrating-tube densimetry over the temperature range 373.15 = T/K = 573.15 at pressures close to the saturated vapour pressure of pure water. The apparent molar volumes (V.) of Li2SO4(aq) calculated from these data together with previously published data at 343.15 K were fitted using a modified Redlich-Rosenfeld-Meyer equation, which in turn was used to extrapolate the experimental data to infinite dilution to obtain the standard partial molar volumes. Comparison of the present and literature data revealed the latter are inaccurate at low concentrations and are increasingly unreliable at higher temperatures. Combination of the present results with selected literature data produced a reliable equation of state for Li2SO4(aq) covering the temperature and pressure ranges 323.15 = T/K = 573.15 and 0.1 . p/MPa . 40. The volumetric behavior of Li2SO4(aq) was found to differ dramatically from that of Na2SO4(aq) and K2SO4(aq), especially at higher temperatures, higher concentrations, and lower pressures, reflecting the exceptional character of lithium ion hydration. Isobaric expansibilities indicated that Li2SO4(aq) remains a water structure maker over the investigated conditions.
Compounds
#
Formula
Name
1
Li2O4S
lithium sulfate
2
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.