Activity coefficients of LiCl in (PEG 4000 + water) at T = (288.15, 298.15, and 308.15) K

JAIME WILSON MORALES SAAVEDRA, Héctor R. Galleguillos, Teófilo A. Graber, Felipe Hernández-Luis

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20 Scopus citations

Abstract

The electromotive force of the cell containing two ion-selective electrodes (ISE),Na-ISE | LiCl (m), PEG 4000 (w), H 2 O (1 - w) | Cl-ISEhas been measured at temperatures of (288.15, 298.15, and 308.15) K as a function of the mass fraction of PEG 4000 (w) in the mixture. w was varied between 0 and 0.25 in 0.05-unit steps and the molality of the electrolyte (m) was between c.a. (0.03 and 5.8) mol · kg -1. The values of the standard electromotive force, E {ring operator}, were determined 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 E {ring operator} was determined, the mean ionic activity coefficients for LiCl, the Gibbs free energy of transfer from the water to (PEG 4000 + water), and the primary LiCl hydration number were calculated.

Original languageEnglish
Pages (from-to)1255-1260
Number of pages6
JournalJournal of Chemical Thermodynamics
Volume42
Issue number10
DOIs
StatePublished - 1 Oct 2010

Keywords

  • Activity coefficient
  • emf
  • Ion-selective electrode (ISE)
  • LiCl
  • PEG 4000

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