大学化学 >> 2016, Vol. 31 >> Issue (12): 83-85.doi: 10.3866/PKU.DXHX201606011

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从熵的角度解读凝固点降低公式

邢双喜,孙文东*()   

  • 发布日期:2016-12-20
  • 通讯作者: 孙文东 E-mail:sunwd843@nenu.edu.cn
  • 基金资助:
    吉林省教育厅优质教学团队建设项目

Interpreting Freezing Point Depression from the Viewpoint of Entropy

Shuang-Xi XING,Wen-Dong SUN*()   

  • Published:2016-12-20
  • Contact: Wen-Dong SUN E-mail:sunwd843@nenu.edu.cn
  • Supported by:
    吉林省教育厅优质教学团队建设项目

摘要:

利用△G=△H-TS推导了稀溶液凝固点降低公式,根据形成溶液前后相变熵的改变,对公式的含义进行了解读,即凝固点的降低完全归结于溶解过程相比于熔化过程的熵变增加。并对公式的拓展应用进行了简要分析。

关键词: 凝固点降低, 稀溶液的依数性, 相变熵

Abstract:

The equation for depression of the freezing point for dilute solution is derived on the basis of △G=△H-TS. The change of entropy in the solution before and after phase transition reveals that the depression of the freezing point is originated from the larger entropy change in the process of dissolution than that in fusion. The further application of this equation is discussed in a more general manner.

Key words: Freezing point depression, Colligative properties of dilute solution, Phase transition entropy

MSC2000: 

  • G64