Activity coefficients of NaNO3 in poly(ethylene glycol) 4000 + water mixtures at (288.15, 298.15, and 308.15) K

Felipe Hernández-Luis, Jaime W. Morales, Teófilo A. Graber, Héctor R. Galleguillos

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12 Scopus citations


The potential difference of the cell containing two ion-selective electrodes (ISE), Na-ISE|NaNO3(m), PEG 4000(w), H2O(1 - w)|NO3-ISE, has been measured at temperatures of (288.15, 298.15, and 308.15) K as a function of the mass fraction w of poly(ethylene glycol) 4000 (PEG 4000) in a mixed solvent. w was varied between 0 and 0.25 in 0.05-unit steps, and the molality of the electrolyte (m) was between (0.004 and 5.800) mol·kg-1, approximately. The values of the standard potential difference, E0, 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 E0 was determined, the mean ionic activity coefficients for NaNO3 were calculated.

Original languageEnglish
Pages (from-to)4082-4087
Number of pages6
JournalJournal of Chemical and Engineering Data
Issue number9
StatePublished - 9 Sep 2010
Externally publishedYes


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