630-633<span style="font-size:
15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Using
standard standing wave microwave techniques and following Gopala Krishna's
[Trans Faraday Soc, 33 (1957) 767] single frequency (9 .88 GHz) concentration
variational method, the dielectric relaxation times (τ<span style="font-size:14.5pt;mso-bidi-font-size:
7.5pt;font-family:" arial","sans-serif""="">) <span style="font-size:15.0pt;
mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">and the dipole moments
(μ) of the binary mixtures of different molar concentrations of acetone (Ac) in
binary mixtures of acetone and N,N-dimethylacetamide in benzene solutions have
been calculated at different temperatures (25, 30, 35 and 40 °C.
The
energy parameters <span style="font-size:15.5pt;mso-bidi-font-size:
8.5pt;font-family:" times="" new="" roman","serif""="">(ΔHƐ , ΔFƐ<span style="font-size:15.5pt;mso-bidi-font-size:
8.5pt;font-family:" arial","sans-serif""="">,<span style="font-size:
15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""=""> ΔSƐ)
for
the dielectric relaxation process of binary mixtures containing 50% mole
fractions of Ac have been calculated, at the respective given temperatures.
Comparison has been made with the corresponding energy parameters for viscous
now. From the observations, it is found that the dielectric relaxation process
like the viscous now process can be treated as the rate process. On the basis
of above studies, solute-solvent type of the molecular association can be
predicted.
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