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    Review of 'Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene'

    Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xyleneCrossref
    Scientific approach was interesting, but modification is preferred.
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    Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

    Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes, and excess dielectric properties for mixtures of carbon tetrachloride with benzene, toluene and p-xylene. These excess properties were calculated from measurements of density, static permittivity and refractive index over the whole range of concentrations, at 298.15K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich-Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products.

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      Review text

      General) Accurate measurements of static permittivity and refractive index were conducted at well-controlled condition. Intermolecular reaction of mixture material of carbon tetrachloride was discussed by using dielectric excess (difference of the measurement result from static permittivity of ideal mixture) as measure. This measure was used to verify interaction of complexes by generating fitting curve of physical parametric model by solving least square problem.

      1) Page 2, measurement section: Finding in this paper was depending on the accurate measurement of static permittivity and refractive index. Authors described accuracy for each measure at measurement section. However, authors must add comment how these errors were derived or determined. As a same manner, evidence for accuracy described in measurement section is preferred to add, such as temperature.

      2) Authors mentioned that existence of complex for CCL4:2C6H6 was considered rather than CCL4:C6H6. It was due to disagreement of fitting curve to the dielectric excesses from the measurement for CCL4:C6H6. However, the agreement in the fitting curves to the measurement data were not so clear in Fig. 9. Can authors comment with more detail on that and elaborate their explanation. (Another suggestion) Typically distribution test, such method as chai-squared test or t-test, is used to validate the proposed model. I think the statistically evidence may obtained if p-value for each model has clear difference.

      3) Page 6, left column and page 7 right column: Fitting procedures were precisely described to obtain the theoretically curve at each point. I recommend authors to add flow chart to make clear the procedure of your proposal method.

      1. Fig. 1-9: Please add what error bars indicate at appropriate points.
      2. Fig 9: Please check figure caption. Explanation for the line is duplicated.


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