Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (08): 759-764.doi: 10.3866/PKU.WHXB19940819

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Enthalpies of Dilution and Relative Apparent Molal Enthalpies of the Major Aqueous Salts of Salt Lakes at 298.15K

Li Ji-Cai, Zhai Zong-Xi, Zeng Zhong-Min, Wang Lu-Ying   

  1. Qinghai Institute of Salt Lakes,Academia Sinica,Xining 810008
  • Received:1993-04-24 Revised:1993-10-22 Published:1994-08-15
  • Contact: Li Ji-Cai


The heat of dilution of aqueous solution of the chloride(KCl, NaCl, MgCl2,CaCl2) and sulfate (Na2SO4, K2SO4, MgSO4) of Salt Lakes were measured over a concentration range of 0.05-2.1mol•kg-1 at 298.15K. The data were extrapolated to infinite dilution by use of the Debye-Huckel limition law to obtain relative apparent molal enthalpies (ФLi). The enthalpies of dilution were calculated using the ion interaction model of Pitzer. The experimental enthalpies (△He) were compared with calculated values (△Hc)of dilution.

Key words: Heat of dilution, Apparent molal enthalpy, Chloride, Sulfate, Salt Lakes