versión On-line ISSN 0718-0764
PAEZ, Manuel S; LAFONT, Jennifer J y ALVIS, Armando. Densities and Volumetric Properties of Mixtures N,N-Dimethylformamide + Water at Constant Pressure of 98.93 kPa and various Temperatures. Inf. tecnol. [online]. 2009, vol.20, n.5, pp. 47-54. ISSN 0718-0764. http://dx.doi.org/10.4067/S0718-07642009000500007.
This work provides a set of volumetric data to evaluate the influence of the concentration and the temperature on the molecular interactions between N, N-Dimetilformamida (DMF) and water. Densities of binary aqueous mixtures of N, N-Dimethylformamide (DMF) were measured over the entire composition range at constant pressure of 98.93 kPa and at temperatures from 293,15K and 313,15K using a vibrating-tube densimeter. Excess molar volumes and partial molar volume at infinite dilution were also calculated. The partial molar volumes at infinite dilution of DMF in aqueous solution were obtained by extrapolation at each temperature. The excess molar volumes were calculated from density data and fitted to the Redlich-Kister polynomial equation. The DMF presents a hydrophobic behavior similar to other organic solutes in water such alcohols and polyols.
Palabras llave : density; volumetric properties; aqueous solutions; molecular interactions.