Measurement and Modeling of Mean Ionic Activity Coefficient in Aqueous Solution Containing NaNO3 and Poly Ethylene Glycol
نویسندگان
1 Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
2 Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
3 Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
4 Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
5 Chemical Engineering Department, Iran University of Science and Technology, Tehran, I.R. IRAN
doi
10.30492/ijcce.2013.5865چکیده
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.
