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Equilibrium on the hydrolysis of boron trifluoride in large amount of water

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Abstract

In order to clarify the equilibrium components in the hydrolysis solution of boron trifluoride(BF3-H2O), the BF3-H2O was prepared by mixing BF3-CH3OH with large amount of water, in which the stoichiometric concentration of BF3 is less than 0.1 mol/L. Two ionic equilibrium models were proposed to simulate the hydrolysis equilibrium of BF3 and tested by special acid-base titration technique. The most accurate ion equilibrium constants were determined. The model, which was assumed to have no HF, was proved to be more representative for the real system and used to simulate the hydrolysis equilibrium of BF3. The simulation suggested that H+, BF4 -, BF3OH- and H3BO3 were the main species in the dilute hydrolysis solution, while BF2(OH)2 - and F- were insignificant species whose concentrations were both in the order of 10-4 mol/L magnitude, and BF(OH)3 - could be omitted because its concentration almost equaled zero. Meanwhile, the equilibrium constant of the overall ionic reaction at 25 °C was obtained as 161.6.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Weijiang Zhang  (张卫江), Tianyu Liu  (刘天雨) & Jiao Xu  (徐 姣)

  2. College of Chemistry and Life Science, Weinan Normal University, Weinan, 714099, China

    Wuke Lang  (郎五可)

Authors
  1. Weijiang Zhang  (张卫江)
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  2. Tianyu Liu  (刘天雨)
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  3. Wuke Lang  (郎五可)
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  4. Jiao Xu  (徐 姣)
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Corresponding authors

Correspondence to Wuke Lang  (郎五可) or Jiao Xu  (徐 姣).

Additional information

Supported by the Independent Innovation Fund of Tianjin University (No. 1307).

Zhang Weijiang, born in 1953, male, Dr, Prof.

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Zhang, W., Liu, T., Lang, W. et al. Equilibrium on the hydrolysis of boron trifluoride in large amount of water. Trans. Tianjin Univ. 22, 486–491 (2016). https://doi.org/10.1007/s12209-016-2638-6

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  • DOI: https://doi.org/10.1007/s12209-016-2638-6

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