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Citation: Wang Qin-Ping, Lü Dian-Zhen, Zhang Li, Sun Xue-Li, Yang Jia-Zhen. Thermodynamics of Mixed Electrolytes in Mixed Solvents of Glycol and Water[J]. Acta Physico-Chimica Sinica, ;2003, 19(02): 115-119. doi: 10.3866/PKU.WHXB20030205 shu

Thermodynamics of Mixed Electrolytes in Mixed Solvents of Glycol and Water

1.
Department of Chemistry, Liaoning University, Shenyang　110036

Received Date: 1 April 2002
Available Online: 15 February 2003

The thermodynamic properties of system HCl-NaCl-C2H6O2-H2O was studied by EMF measurement in the cells without liquid junction: Pt, H2 (105 Pa)|HCl (m), C2H6O2 (w), H2O (1－w) | AgCl-Ag (A) Pt, H2 (105 Pa)|HCl (mA), NaCl (mB), C2H6O2 (w), H2O（1－w）| AgCl-Ag (B) at constant total ionic strength I=0.5, 1.0, 1.5 and 2.0 mol•kg－1, from 5 to 45 ℃, where mA and mB are the molalities of HCl and NaCl, respectively, w is the mass fraction of glycol in the mixed solvent, which is 10％ during all measurement. The standard electrode potential of Ag-AgCl in the mixed solvent has been determined from cell (A). The activity coefficients of HCl γA in the mixed solvent system have been determined from cell(B). The results show that the activity coefficients of HCl in HCl-NaCl solutions still obey Harned’s Rule. The standard transfer Gibbs free energies of HCl have been calculated. The primary, secondary and total medium effects of HCl have been calculated and discussed.
- Activity coefficients;Harned’s rule;EMF;Medium effect;Glycol
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