University Chemistry ›› 2018, Vol. 33 ›› Issue (5): 61-65.doi: 10.3866/PKU.DXHX201801010

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Relationship and Difference among Raoult's Law, Henry's Law, and Azeotropic Solution

Xuebo YIN1,2,*()   

  1. 1 College of Chemistry and Environmental Sciences, Kashgar University, Kashgar 844006, Xinjiang Uygur Autonomous Region, P. R. China
    2 Research Center for Analytical Science, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2018-01-07 Published:2018-05-18
  • Contact: Xuebo YIN
  • Supported by:


Gas-liquid equilibrium is important in classroom teaching and practical production. In this paper, the relationship and difference among Raoult's Law, Henry's Law, and azeotropic solution are discussed from the point of microscopic view. The different interactions between solvent-solvent, solvent-solute, and solute-solute lead to that the two laws are only useful for dilute solution. When the apparent vapor pressure of the solvent and solute are equal to each other by tuning their mole fraction, the azeotropic solution is produced.

Key words: Raoult's Law, Henry's Law, Azeotropic solution, Microscopic view


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