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一、问题的提出现行的初中化学教材中实验物质的导电性~([1])以及中等师范学校化学教材中强、弱电解质溶液导电能力比较的实验装置~([2]),对学生正确理解电解质、非电解质、强电解质、弱电解质的概念十分重要。但该实验导线连接凌乱,安装复杂,对比性差,试剂用量大,烧杯不固定,易倾倒洒出试液,造成腐蚀,直接使用220 V交流电,极易发生触电情况。虽然已有一些改进的实验装置,解决了电线连接凌乱,安装复杂的问题,但其盛放溶液的容器较大,且不固定,没有变压器和低压开关,使用时需要配备学生电源。
I. Problems raised The current experimental materials for junior high school chemistry textbooks ([1]) and the experimental facilities for comparing the conductivity of strong and weak electrolyte solutions in secondary chemistry school textbooks ([2]) are correct. It is important to understand the concepts of electrolytes, non-electrolytes, strong electrolytes, and weak electrolytes. However, the experimental leads have a messy connection, complicated installation, poor contrast, large amount of reagents, beakers that are not fixed, spilling and spilling test solutions, causing corrosion, and direct use of 220 V AC, which can easily cause electric shocks. Although there are some improved experimental devices that solve the problem of messy connection and complicated installation of the wires, the containers for containing the solutions are large and not fixed, there are no transformers and low-voltage switches, and students need to be equipped with power supplies.