大学化学 >> 2022, Vol. 37 >> Issue (12): 2210014.doi: 10.3866/PKU.DXHX202210014

所属专题： 第54届国际化学奥林匹克专刊

专题 上一篇    

关于第54届国际化学奥林匹克试题4-9的表观解离常数计算的讨论

张思翰, 梁驰予, 邱晓航()   

  • 收稿日期:2022-10-05 录用日期:2022-10-12 发布日期:2022-10-25
  • 通讯作者: 邱晓航 E-mail:qiuxh@nankai.edu.cn
  • 作者简介:邱晓航, Email: qiuxh@nankai.edu.cn

Discussion on the Calculation of Apparent Dissociation Constant in Problem 4-9 of the 54th International Chemistry Olympiad

Sihan Zhang, Chiyu Liang, Xiaohang Qiu()   

  • Received:2022-10-05 Accepted:2022-10-12 Published:2022-10-25
  • Contact: Xiaohang Qiu E-mail:qiuxh@nankai.edu.cn

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摘要：

化学平衡中蕴含着反应进行限度的信息，是物理化学的重要研究对象。第54届国际化学奥林匹克(IChO)试题4-9以锂硫电池中多硫化锂的溶剂化问题为背景，考查了学生对多构象化合物平衡体系反应表观平衡常数的理解及计算。本文将从热力学与统计物理学的角度，讨论如何合理地将多硫化锂两个构象的加权自由能与表观平衡常数关联起来。

关键词: 化学平衡, 化学热力学, 平衡常数, 多硫化物

Abstract:

Chemical equilibrium contains information on the extent of reaction, which is an important part of physical chemistry. In the context of the solvation of lithium polysulfide in lithium-sulfur batteries, Q4-9 of the 54th International Chemistry Olympiad (IChO) examined students' understanding and calculation of the apparent equilibrium constant of the reaction in the equilibrium system of multi conformational compounds. This article will discuss how to apply the weighted average of the free energy of the two conformations of lithium polysulfide to calculate the apparent equilibrium constant from the perspective of thermodynamics and statistical physics.

Key words: Chemical equilibrium, Thermochemistry, Equilibrium constant, Polysulfide