Abstract:
The
dynamic viscosity was measured for water-phenol binary mixture at
several concentrations and temperatures to determine the critical
concentration and critical temperature. The critical concentration was
determined at XC = 33.90% by weight of phenol, the critical temperature
was TC = 67.0oC determined from the viscosity measurements. The
electrical conductivity measurements showed that TC = 67.8oC at XC =
33.90% by weight of phenol. The electrical conductivity measurements for
various concentrations (0.00%, 10.17%, 20.80% and 50.00%) by weight of
phenol were fitted by using Arhenius equation. The activation energy and
the electrical conductivity at infinite temperature were calculated for
several concentrations. The electrical conductivity as a function of
temperature was fitted by using power law above the critical temperature
and critical concentration. The noncritical part of the measured
electrical was found to be 30.26µS/cm and the critical exponent value
was 0.032. The molar electrical conductivity was calculated and plotted
by using Walden rule. The slope of Walden plot was found to be 0.9439.
The water – phenol mixture is classified as a poor ionic mixture.