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

Authors

  • Farzaneh Feyzi Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
  • Parinaz Alimardani Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
  • Sara Kazemi Sabzvar Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
  • Siamak Modarresi Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
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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Journal title

volume 32  issue 2

pages  31- 39

publication date 2013-06-01

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