Densities of (water+ hexamethylphosphoric triamide) mixtures in the entire mole-fraction composition at five temperatures, from (288.15 to 308.15) K, and atmospheric pressure were measured by using a magnetic float densimeter with an error of +- 1.1 x 10-5 g cm-3. Excess molar volumes of the mixtures and apparent molar volumes of the components (down to their infinite dilution) were calculated. The volumetric effects of mixing being very large in magnitude present negative deviations from ideality and become decreasingly negative with increasing temperature. The apparent molar volume of organic co-solvent displays a clearly pronounced minimum in the water-rich region at all the temperatures studied. It have been shown that there is a thermodynamically substantiated interrelation between volume and enthalpy properties of the mixtures considered.
Compounds
#
Formula
Name
1
C6H18N3OP
tris(dimethylamino)phosphine oxide
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.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Mass density, kg/m3 ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Buoyancy - hydrostatic balance with magnetic suspension - one sinker
5
POMD
1
2
Mass density, kg/m3 ; Liquid
Temperature, K; Liquid
Mole fraction - 1; Liquid
Pressure, kPa; Liquid
Liquid
Buoyancy - hydrostatic balance with magnetic suspension - one sinker