Abstract

ROMERO, Carmen M; LUIS H, Blanco; GONZALEZ, María E  and  DAVILA, María T. CONSTRUCTION AND CALIBRATION OF AN ISOPIESTIC APPARATUS FOR DETERMINATION OF OSMOTIC AND ACTIVITY COEFFICIENTS. Rev.Colomb.Quim. [online]. 2006, vol.35, n.2, pp.205-214. ISSN 0120-2804.

An isopiestic apparatus for determination of osmotic coefficients of aqueous solutions using NaCl reference solutions is described. Measurements were made at 288,15 K, 293,15 K and 298,15 K. Equilibrium times between 12 and 20 days were required for molalities between 0,1 and 0,6 m. Osmotic coefficients of aqueous KCl solutions obtained by the isopiestic method and calculated activity coefficients are compared with literature data.

Keywords : Isopiestic method; activity coefficients; aqueous solutions; osmotic coefficients.

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