电动势法测量多相反应体系热力学函数的问题与思考

Problems and Pondering in EMF Methods for Measuring Thermodynamic Functions of Multiphase Reaction System

采用电动势法测定了由Ag/AgCl与Hg/Hg2Cl2所组成的多相反应体系热力学函数。对消法测定了以饱和KCl水溶液为电解质,以自制的Ag/AgCl/Cl-(a)(银/氯化银)电极与几个商品饱和Hg/Hg2Cl2/Cl-(a)(甘汞)电极组成的一系列原电池的电动势,在教学实践中发现,不同的商品饱和甘汞电极对测量结果存在很大差异。

Thermodynamic functions of muhiphase reaction system, which consisted of Ag/AgCl and Hg/Hg2Cl2, were measured by EMF methods. In our teaching practice, the EMF testing results of electromotive forces of a series of galvanic cells, which consisted of KCl electrolyte saturated solution, self-manufactured Ag/AgC1/Cl-（a）（silver/silver chloride） and commodity Hg/Hg2Cl2/Cl-（a）（calomel） electrodes, were found to be very different among the calomel electrodes.