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Citation: WANG Qin-Ping, LU Dian-Zhen, SUN Xue-Li. On the Thermodynamic Properties of HCl in the System HCl-C₃H₈O₃-NaCl-H₂O[J]. Chinese Journal of Applied Chemistry, ;2003, 20(2): 149-154. shu

On the Thermodynamic Properties of HCl in the System HCl-C₃H₈O₃-NaCl-H₂O

1.
Department of Chemistry, Liaoning University, Shenyang 110036

Corresponding author: WANG Qin-Ping,
Received Date: 16 July 2002
Available Online: 12 November 2002
Fund Project: 辽宁省自然科学基金资助项目(9810300902) (9810300902)

The thermodynamic property of HCl-C₃H₈O₃-NaCl-H₂O system has been studied by emf measurement in the cells without liquid junction at 5 to 45℃:Pt,H₂(10⁵ Pa)|HCl(c),C₃H₈O₃(w),H₂O(1-w)|AgCl-Ag (A) Pt,H₂(10⁵ Pa)|HCl(c_A),NaCl(c_B),C₃H₈O₃(w),H₂O(1-w)|AgCl-Ag (B) with the mass fraction of glycerol ω(C₃H₈O₃)=5%, 15% and 20% at a total ionic strength I=1.00 mol/kg. The standard electrode potential of Ag-AgCl in the mixed solvent was determined for cell(A). The activity coefficient γ_A of HCl in the mixed solvent system was determined from cell(B). The results show that the acti-vity coefficient of HCl in HCl-NaCl solutions still obeys Harned's rule and lg γ_A is linear to the reciprocal of the absolute temperature at constant composition of the mixture. Relative molar enthalpies L_A of HCl are in linear function with the ionic strength fraction of NaCl at constant total ionic strength and temperature. The standard transfer Gibbs free energies of HCl from water to mixed sovents were calculated. The primary, secondary and total medium effect of HCl were calculated and discussed.
- activity coefficient,
- emf,
- hydrochloric acid,
- liquid junction free cell,
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On the Thermodynamic Properties of HCl in the System HCl-C₃H₈O₃-NaCl-H₂O