Abstract

ROMERO, Carmen M.; SUAREZ, Andrés F.  and  JIMENEZ, Eulogio. EFFECT OF TEMPERATURE ON THE VOLUMETRIC PROPERTIES OF ALIPHATIC ALCOHOLS IN DILUTE AQUEOUS SOLUTIONS. Rev.Colomb.Quim. [online]. 2007, vol.36, n.3, pp.377-386. ISSN 0120-2804.

The effect of temperature on the behavior of volumetric and surface properties of aqueous solutions has often been used to obtain information about solute effect on water structure. In this work, we present experimental results for densities of dilute aqueous solutions of n-pentanol, n-hexanol, n-heptanol and n-octanol at 288.15; 293.15; 298.15; 303.15 and 308.15 K. Density measurements were realized using an Anton Paar (DMA 60/602) vibrating tube densimeter. Excess volumes, apparent volumes and molar partial volumes at infinite dilution were evaluated from density data. The second derivate of partial molar volume with temperature was used to determine the hydrophobic character of the solutes and their effect on the water structure. The volumetric contribution of CH2 group was evaluated and it has a constant value at the studied temperatures.

Keywords : Alcohols; partial molar volumes; group contribution; solute-solvent interactions.

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