Densities of binary mixtures of diethylsulfoxide (DESO) with water and dimethylsulfoxide (DMSO) with water have been measured over the full range of compositions at temperatures from 298.15 K to 343.15 K by means of a vibrating-tube densimeter. The excess molar volumes V E m, calculated from the density data, are negative over the whole range of composition and temperature. The V E m curves exhibit a minimum at about x @ 0.4. These data conform with those for dimethylsulfoxide (DMSO + water) system known from literature at different temperatures as well. Our data additionally confirm that very strong interactions take place between DESO and water, even stronger than those between DMSO and water. This behaviour could explain the strong deviations from the ideality observed in this system. The V E m results were correlated using a modified Redlich Kister expansion. The partial molar volumes increase with increasing mole fraction and temperature. The excess partial olar volume of sulfoxide at infinite dilution, V E;1 2 , at each temperature (DMSO + H2O) and (DESO + H2O) imxtures is positive. For (DESO + H2O) system the dependence of the expansion coefficient against mole fraction of DESO reveals a maximum which is additionally supports the hypothesis of a strong (DESO + water) interactions.
Compounds
#
Formula
Name
1
C4H10OS
diethyl sulfoxide
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.