Electromotiye force measurements of activity coefficients for the ternary system (CsBr + NaBr + H2O)
XIE Pei-pei, LI Shu-ni, ZHAI Quan-guo, JIANG Yu-cheng , HU Man-cheng*
(Key Laboratory of Macromolecular Science of Shaanxi Province, College of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi′an 710062, Shaanxi,China)
Abstract:
Activity coefficients of the ternary system (CsBr + NaBr + H2O) were determined by electromotive force (EMF) measurements using the cell: Cs-ion selective electrode(ISE)︱CsBr(mA), NaBr (mB)︱Br-ion selective electrode(ISE) at 298.15 K, and over total ionic strengths from range 0.01 to 1.0 mol/kg for different ionic strength fractions (0.25, 0.5 and 0.75). The experimental data were satisfactorily described via the Pitzer and Harned models. The Pitzer binary and ternary ionic interaction parameters and the Harned parameters have also been calculated.
KeyWords:
electromotive force(EMF) measurements; CsBr; activity coefficient; pitzer model; Harned model
