Abstract

Roksana Khatun, Rajia Sultana and Ranjit K. Nath

DOI : http://dx.doi.org/10.13005/ojc/340407

The observations on the anomalous behavior of urea and the comparison between urea and thiourea in aqueous solutions  have been examined by volumetric and ultrasonic sound velocity techniques at different temperature (298.15, 303.15, 308.15, 313.15, 318.15 and 323.15 K) , atmospheric pressure by using a high accuracy vibrating U-tube digital density and ultrasonic sound velocity analyzer. The apparent molar volume (ϕ_v) & apparent molar adiabatic compressibility (ϕ_k)  have been calculated from experimental density and ultrasonic sound velocity data respectively and  limiting apparent molar volume (ϕ_v⁰), limiting apparent molar adiabatic compressibility (ϕ_k⁰) have been evaluated from apparent molar volume vs. molality  plot as intercept. Apparent molar expansibility (ϕ_E)  was determined from apparent molar volume and hydration number (n_H) from adiabatic compressibility. The results show very interesting information about strong solute-solvent & solute-solute interactions,  and also elaborate the structure making or breaking behavior in the solution mixtures.

Apparent Molar Volume; Expansibility; Hydration Number; Sound Velocity; Thiourea; Urea.

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