介绍一个电化学实验“混合熵的测定”

Introduction of an electrochemical experiment“Determination of mixed entropy”

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.