Activity coefficients of KCl in PEG 4000+water mixtures at 288.15, 298.15 and 308.15K

Felipe Hernández-Luis, Raquel Rodríguez-Raposo, Héctor R. Galleguillos, Jaime W. Morales

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

24 Citas (Scopus)

Resumen

The electromotive force of the cell containing two ion-selective electrodes (ISE), K-ISEvertical barKCl(m), PEG 4000(Y), H2O(100-Y)vertical barCl-ISE has been measured at temperatures of 288.15, 298.15, and 308.15K as a function of the weight percentage Y of PEG 4000 in a mixed solvent. Y was varied between 0 and 25wt.% in five-unit steps and the molality of the electrolyte (m) was between ca. 0.05molkg-1 and almost saturation. The values of the standard electromotive force were calculated using routine methods of extrapolation together with extended Debye-Hückel and Pitzer equations. The results obtained produced good internal consistency for all the temperatures studied. Once the standard electromotive force was determined, mean ionic activity coefficients for KCl, Gibbs energy of transfer from the water to PEG 4000+water mixtures, interaction parameters (gEN, hEN, sEN, cp,EN), salting constants, and the KCl primary hydration number were estimated and comparatively discussed in terms of a model of structural and electrostatic interactions with those of the LiCl and NaCl previously obtained in similar mixtures.

Idioma originalInglés
Páginas (desde-hasta)163-171
Número de páginas9
PublicaciónFluid Phase Equilibria
Volumen295
N.º2
DOI
EstadoPublicada - ago. 2010
Publicado de forma externa

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