Measurement and Modeling of Mean Activity Coefficients in Ternary Electrolyte System (Nicl2/Triton X-100/H2O) at T=298.15 ± 0.1 K

Document Type : Research Article


Department of Chemistry, Faculty of Science, Lahijan Branch, Islamic Azad University, Lahijan, I.R. IRAN


In this work, the results relating to the thermodynamic properties of the ternary electrolyte system of (NiCl2 + Triton X-100 + water) using the potentiometric method were reported at T = 298.15 K. The electromotive force measurements were carried out on the galvanic cell without a liquid junction of the type: Ni2+-ISE | NiCl2 (m), Triton X-100 (%wt.), H2O (100-%wt.) | AgCl|Ag over total ionic strengths from 0.0010 to 6.0000 mol/kg for different percentage mass fraction of Triton X-100 (%wt. = 0.0, 1.0, 2.5, 5.0, 7.5, and 10.0). The mean activity coefficients of NiCl2 were determined by using potentiometric data. Then, the mean activity coefficients of NiCl2 were correlated with the Pitzer ion interaction model and TCPC model. The Pitzer ion-interaction parameters (βo, β1 and ) and the adjustable parameters (b and S) of TCPC model were determined by correlating data for the series under-investigated system. The Pitzer ion interaction parameters were used to calculate thermodynamic properties such as the osmotic coefficients and the excess Gibbs energy of the solution. The result showed that the Pitzer ion interaction model could be used to investigate the system, successfully.


Main Subjects

[1] Ghanadzadeh H., Daghbandan A., Akbarizadeh M., Applying Pareto Design of GMDH-Type Neural Network for Solid-Liquid Equilibrium of Binary Systems (Isotactic Poly 1-Butene (1)-Organic Solvents (2)), Iran. J. Chem. Chem. Eng. (IJCCE),
33 (1): 67-73 (2014).
[2] Boukhalfa N., Meniai A.H., Thermodynamic Modeling of Aqueous Electrolytes Type 2-1, Procedia Eng., 148: 1121–1129 (2016 ).
[4] Pitzer K.S., Kim J.J., Thermodynamics of Electrolytes. IV. Activity and Osmotic Coefficients for Mixed Electrolytes, J. Am. Chem. Soc., 96: 5701-5707 (1974).
[5] Ivanovic T., Popovic D.Z., Miladinovic J., Rard J.A., Miladinovic Z.P., Pastor F.T., Isopiestic Determination of the Osmotic and Activity Coefficients of {yK2HPO4+(1- y)KH2PO4}(aq) at T = 298.15 K, J. Chem. Thermodyn., 142: 1-15 (2020).
[7] Ghalami-Choobar B., Mohammadian M., Thermodynamic modeling of the KCl+Glucose+Water System Based on Potentiometric Measurements at 298.15 K, J. of Mol. Liq., 154: 26–30 (2010).
[8] Ghalami-Choobar B., Mirzaie S., Thermodynamic Study of (KCl+proline+water) System Based on Potentiometric Measurements at T=(298.2 and 303.2) K, J. Mol. Liq., 169: 124–129 (2012).
[10] Ghalami-Choobar B., Mossayyebzadeh-Shalkoohi P., Thermodynamic Modeling of Quaternary (CaCl2 +‏ Ca(NO3)2 +‏ Lalanine‏ + water) System Based on Potentiometric Measurements at T (298.2, 303.2 and 308.2) K: Experimental Measurements and Thermodynamic Modeling, Fluid Phase Equilib., 437: 103-117 (2017).
[12] Hao X., Li S., Zhai Q., Jiang Y., Hu M., Activity Coefficients of CsF in (Urea + H2O) or (N-methylformamide + H2O) Mixed Solvents at 298.2 K, J. Mol. Liq., 220: 829–835 (2016).
[13] Hao X., Li S., Zhai Q., Jiang Y., Hu M., Phase Equilibrium and Activity Coefficients in Ternary Systems at 298.15 K: RbCl/CsCl + Ethylene Carbonate + Water, J. Chem. Thermodyn., 98: 309–316 (2016).
[16] Morales J.W., Héctor R.G., Hernández-Luis F., Rodríguez-Raposo R.,  Activity Coefficients of NaClO4 in (PEG 4000 + H2O) Mixtures at 288.15, 298.15 and 308.15 K, Iran. J. Chem. Chem. Eng. (IJCCE), 39(2): 145-157 (2020).
[17] Modarresi S., Dehghani M.R., Alimardani P., Kazemi Sabzvar S., Feyzi F., Measurement and Modeling of Mean Ionic Activity Coefficient in Aqueous Solution Containing NaNO3 and Poly Ethylene Glycol, Iran. J. Chem. Chem. Eng. (IJCCE), 32(2): 31-39 (2013).
[21] Dai P, Huang H., Ding Z, He Y, Liu S, Osmotic Coefficient and Mean Ion Activity Coefficient of NiCl2 Aqueous Solution at Several Temperatures, J. Chem. Thermodyn., 100: 72–78 (2016).
[22] Bates R.G., “Determination of pH, Theory and Practice”, Second ed., John Wiley, New York, (1964).
[24] Ge X., Zhang M., Guo M., Wang X., Correlation and Prediction of Thermodynamic Properties of Nonaqueous Electrolytes by the Modified TCPC Model, J. Chem. Eng. Data, 53: 149-159 (2008).
[26] Kim H.T., Frederick W.J., Evaluation of Pitzer Ion Interaction Parameters of Aqueous Electrolytes at 25 'C. 1. Single Salt Parameters, J. Chem. Eng. Data, 33: 177-184 (1988).