介绍一个电化学实验“混合熵的测定”  

Introduction of an electrochemical experiment“Determination of mixed entropy”

作　　者：王晓岗 许新华[1] 吴梅芬[1] 樊雅娟 WANG Xiaogang;XU Xinhua;WU Meifen;FAN Yajuan(School of Chemical Science and Engineering,Tongji University,Shanghai 200092,China;Graduate School,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学化学科学与工程学院,上海200092 [2]同济大学研究生院,上海200092

出　　处：《实验室科学》2020年第2期16-19,共4页Laboratory Science

基　　金：同济大学第十一期精品实验项目(项目编号:1380104102)。

摘　　要：介绍了一个新的电化学实验,以铁氰化钾和亚铁氰化钾为研究体系,利用二者的共轭溶液设计可逆电池,将溶液的混合过程用一系列比例不同的共轭溶液组成的可逆电池代替。通过测定电池的电动势,获得电动势和溶液浓度的关系,再通过多项式拟合,得到溶液混合过程的热力学函数混合熵ΔS。介绍了实验的设计思路,探讨了该实验用于本科教学所取得的教学效果。A new electrochemical experiment was introduced in this paper.A reversible primary cells was designed on the basis of a pair of conjugated solution of hexacyanoferrate(Ⅱ)and hexacyanoferrate(Ⅲ),and the actual mixing process was simulated with a number of static states by gradually changing the ratio of two components in conjugated solutions.By measuring the electromotive force(E)of each cell,the relationship between E and concentration of solution was established.Then,the mixed entropy of hexacyanoferrate(Ⅱ)and hexacyanoferrate(Ⅲ)was calculated through polynomial fitting technology.This paper explained the design idea of the cell and discussed the teaching effect of this experiment in undergraduate teaching.

关 键 词：可逆电池 混合熵 测定 实验教学 

分 类 号：O6-32[理学—化学] O657.63