Static dielectric constants of acetonitrile/water mixtures in the whole composition range and within the temperature range from (15 to 60) deg C have been measured. The values were fitted to a unique equation as a simultaneous function of temperature and acetonitrile composition. Densities of these mixtures at temperatures from (5 to 55) deg C and different compositions have been collected from the literature. The complete data set was critically analyzed, the outliers were excluded, and the remaining values were also fitted to a unique equation as a function of temperature and acetonitrile composition. From the dielectric constants and densities, the activity coefficients of ions can be calculated by means of the Debye-Huckel approach, allowing the study of the ionic equilibria and determination of reference pH values or acidity constants in any acetonitrile/water mixture at any temperature within the studied range.
Compounds
#
Formula
Name
1
C2H3N
acetonitrile
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
Relative permittivity at various frequencies ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Frequency, MHz; Liquid
Liquid
Coaxial cylinder capacitor
10
POMD
1
2
Relative permittivity at various frequencies ; Liquid