Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (12): 1101-1104.doi: 10.3866/PKU.WHXB19951209

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Study on the Reaction Thermochemistry of Simulated Synthesized Brine during Hydrochloric Acid Titration

Li Wu,Gao Shi-Yang,Zeng Zhong-Min,Xia Shu-Ping   

  1. Institute of Qinghai Salt Lakes,Academia Sinica,Xining 810008
  • Received:1995-02-28 Revised:1995-04-24 Published:1995-12-15
  • Contact: Li Wu

Abstract:

The enthalpy changes of MgO﹒2B2O3-27.56% MgCl2-H2O and H3BO3-27.56%MgCls-H2O solution during azeotropic hydrochloric acid titration have been studied with Sweden LKB8700-1 precise calorimeter. The results indicated that the reaction enthalpy changes of solutes (expressed as H3BO3 and MgO﹒2B2O3) increase with the increase of their concentrations in the solution. Combined with the pH titration curves of MgO﹒2B2O3-27.56% MgCl2-H2O with that of azeotropic hydrochloric acid, the reaction mechanism of the solutions with hydrochloric acid has been discussed.

Key words: Magnesium tetraborate, Magnesium chloride solution, Calorimetric titration, Mechanism