Thermoacoustical response of 1,4-dioxane with carboxylic acids

Abstract

Experimental values of ultrasonic velocity (u), density (ρ), refractive index (n) and viscosity (η) for the binary mixtures of 1,4-dioxane with acetic acid and propionic acid have been measured at 293, 303 and 313 K over the entire mole fraction range. Using these data, the excess adiabatic compressibility , deviation in viscosity (Δη), excess intermolecular free length , molar compressibility (B), molecular radius (r _m), relaxation strength (r), and van der wall's constant (b) have been calculated. These parameters were used to study the nature and extent of intermolecular interaction between component molecules present in the binary mixtures. Excess values of β_s and η were plotted against the mole fraction of 1,4-dioxane over the whole composition range. The values of , Δη and for two binary mixtures have been found to be negative which suggest the presence of weak molecular interaction in these mixtures. Molecular radius (r _m) and relaxation strength (r) of liquid mixtures were also evaluated since these parameters are useful in prediction of molecular properties of liquid mixtures.

Keywords:

• 1,4-Dioxane
• Acetic acid
• Propionic acid
• Excess adiabatic compressibility
• Viscosity deviation

Acknowledgement

The authors are thankful to Prof. J.D. Pandey, Emeritus Fellow UGC, Former Head, Chemistry Department, Allahabad University for continuous and whole-hearted support and valuable discussions.