Author： Farzad Deyhimi Rahman Salamat-Ahangari Bahram Ghalami-Tchoobar
Publisher： Taylor & Francis Ltd
ISSN： 0031-9104
Source： Physics and Chemistry of Liquids, Vol.41, Iss.6, 2003-12, pp. : 605-611
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Abstract
Activity coefficients of NH4Cl in methanol-water mixtures containing respectively 0, 10, 20, 30, 40, and 50 weight percent MeOH 25°C were determined using the Pitzer ion-interaction model and the electromotive force (emf) data of the following galvanic cell without a liquid junction: . The experimental emf data were obtained using a solvent polymeric PVC ammonium selective membrane electrode containing a mixture of nonactin/monactin as ionophore and an Ag/AgCl electrode. Activity coefficients were determined over the molality range from dilute solution to near salt saturation (i.e. about 5.15 mol/kg in pure water or 2.44 mol/kg in 50% mixed MeOH-water solvent).
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