Author/Authors :
Modarresi، Siamak نويسنده Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN , , Dehghani Firuzabadi، Mohammad Reza نويسنده , , Alimardani، Parinaz نويسنده Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN , , Kazemi Sabzvar، Sara نويسنده Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN , , Feyzi، Farzaneh نويسنده 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.
