Measurement and modelling of static dielectric constants of aqueous solutions of methanol, ethanol and acetic acid at T = 293.15 K and 91.3 kPa

Static dielectric constants of aqueous solutions of methanol, ethanol and acetic acid at T = 293.15 K and 91.3 kPa were measured at weak electromagnetic field (≪0.001 V) and (≪60 Hz). The static dielectric measurements have been achieved by using the new set up presented in the previous work based on a low-pass filter. From the experimental data, excess dielectric constants, ɛE have been calculated and reported. An empirical polynomial equation was used for correlating the data of the dielectric constants for the aqueous solutions. In addition, the measured static dielectric constants data have been calculated on the basis of the empirical modification of the Kirkwood theory for multicomponent systems. According to the average absolute deviations obtained between experimental and calculated data, the calculated dielectric constants of aqueous solutions studied in this work are generally in good agreement with the experimental data.

► Dielectric constant of aqueous solutions at 293.15 K and 91.3 kPa were measured.
► The excess dielectric constants, εE have been calculated.
► The dielectric constants data were correlated by an empirical equation.
► The empirical modification of the Kirkwood theory was used for the calculations.