物理化学电势-pH实验教学的拓展与探索性分析

Analysis of expansion and exploratory for the experiment teaching of potential-pH in the physical chemistry

电极电势-pH图已广泛应用于湿法冶金、金属腐蚀和电极电镀等领域。物理化学实验中对电极电势-pH图的常见测定方法和原理进行了阐述,如果在实验教学中对该实验进一步的拓展和探索,对于激发学生创新能力、培养科学素养必将大有裨益。通过电极电势-pH实验的教学过程,在常见测定方法的基础上,以激发学生科学实验的主动性和创新性为目的,深入探讨了EDTA酸效应的相关理论知识,系统分析了EDTA二钠盐和EDTA四钠盐对于待测定的Fe^(3+)/Fe^(2+)-EDTA体系电势-pH图的影响。同时,通过实验方法的综合创新,对实验教学过程中出现的新问题、新现象进行了深入挖掘和系统探讨,培养并提高了学生独立开展实验研究、探索知识的浓厚兴趣。

The potential-pH diagram has been widely applied in various fields including the wet metallurgy,metal corrosion research,electrode electroplating,etc.,and the common determination methods and principles of potential-pH diagram for the physical chemistry experiment are describe.If the experiment is further expanded and explored in the experiment teaching,it will be highly beneficial to arouse the students’creative abilities and cultivate their scientific literacy.Herein,in order to stimulate the initiative and innovation of students,the theoretical knowledge of acid effect for EDTA was deeply discussed,and the effects of the EDTA-2Na salt and EDTA-4Na salt on the potential-pH diagram for the system of Fe^(3+)/Fe^(2+)-EDTA were systematically analyzed on the base of the common determination methods of potential-pH diagram for the process of the experiment teaching.Meanwhile,the new problems and phenomena in the course of experimental teaching were also deeply explored and systematically discussed with the help of the comprehensive innovation,achieving the goal of cultivating and improving the students’strong interests of independent experimental study and exploring knowledge.