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Determination of thermodynamic properties of aqueous mixtures of MgCl2 and Mg(NO3)2 by the potentiometric method at T = 298.15 |
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| Authors: | Mohammad PournaghdyMasoud Giahi Mohammad A BagheriniaMajid Monajjemi Hossein Aghaie Mehran Aghaie |
| Institution: | a Department of Chemistry, Islamic Azad University, Science and Research Branch, Tehran, Iran b Department of Chemistry, Faculty of Science, Islamic Azad University, Lahijan Branch, Lahijan, Iran c Faculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran |
| Abstract: | In this research, thermodynamic properties of the ternary electrolyte system (MgCl2 + Mg(NO3)2 + H2O) were investigated using a potentiometric method. The galvanic cell used had no liquid junction of type: Mg-ISE|MgCl2 (mA), Mg(NO3)2 (mB), H2O|Ag/AgCl. The measurements were performed at T = 298.15 K and at total ionic strengths from 0.001 to 8.000 mol/kg for different series of salt ratios r=mMgCl2/mMg2(NO3) =1.00, 2.50, 5.00, 7.50, 10.00 and 15.00. The PVC based magnesium ion-selective electrode (Mg-ISE) and the Ag/AgCl electrode used in this work were prepared in our laboratory and showed a reasonably good Nernst response. The Pitzer ion interaction model and Harned rule were used to illustrate the ternary electrolyte system investigated. The experimental results showed that both Pitzer model and Harned rule were suitable to be used satisfactorily to describe this ternary system. |
| Keywords: | Thermodynamic properties MgCl2 Mg(NO3)2 Pitzer model Potentiometric method |
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