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1. Measurement and Modeling of Mean Ionic Activity Coefficient in Aqueous Solution Containing NaNO3 and Poly Ethylene Glycol

Author

Modarresi, S., Dehghani, M. R., Alimardani, P., Kazemi Sabzvar, S., and Farzaneh Feyzi

Subjects
lcsh:Chemistry, lcsh:QD1-999, polymer, lcsh:TP155-156, electrolyte solution, ion-selective electrode, lcsh:Chemical engineering, activity coefficient
Abstract

Potentiometric investigation on {H2O+NaNO3+PEG1500} mixtures were made at T=308.15K, using electrochemical cells with two ion-selective electrodes, (Na+ glass) as the cation ion-selective electrode against (NO3- solvent-polymer PVC) as the anion ion-selective electrode. The mean ionic activity coefficients of NaNO3 were measured at different concentrations of NaNO3 and PEG. Maximum concentration of electrolyte and PEG were 1 mol/kg and 0.12 mol/kg, respectively. The experimental data was modeled by utilizing the modified Pitzer equation and the activity coefficient ratio of PEG was evaluated by using Maxwell’s cross differential relation.

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