Densities of several aqueous mixtures of 2-pentanol, 3-pentanol, and 2-methyl-2-butanol in the diluted alcohol region were determined in the temperature interval (273.65 282.15) K at atmospheric pressure using the Anton Paar DSA48 vibrating tube densimeter. The variation of the temperature of maximum density with respect to that in pure water DT, its structural contribution DTstr , as well as the partial molar volume of the alcohol v2 and its excess magnitude vE 2 were calculated. It was found that DT decreases as the alcohol mole fraction x2 increases whereas DTstr increases. In both magnitudes, the values for the mixtures of 2-methyl-2-butanol were higher than those of 2-pentanol and 3-pentanol which were found very similar. The secondary or tertiary character of the alcohol seems to be the origin of such differences in complete agreement with previous findings. The slope of the v2 T curve was positive over the working mole fraction interval whereas that of the vE 2 T curve was negative, in complete agreement with the tendencies observed for the DT x2 and DTstr x2 curves, respectively. The consistency check proposed by Armitage et al. was thus once fulfilled.
Compounds
#
Formula
Name
1
C5H12O
pentan-2-ol
2
C5H12O
3-pentanol
3
C5H12O
2-methylbutan-2-ol
4
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.