在电场作用下,电解质溶液中的阳离子向负极移动,阴离子向正极移动。本实验用硫酸铜和重铬酸钾(或硫酸铜与高锰酸钾)的混合溶液能同时看到阴阳两种离子发生迁移,现象明显,比一般只用硫酸铜或高锰酸钾一种溶液作离子迁移实验的效果好。一、仪器本实验所用仪器为用有机玻璃板自制的U形管(仪器示意图和详细制作方法见本刊1980 Under the action of an electric field, cations in the electrolyte solution move toward the negative electrode, and anions move toward the positive electrode. In this experiment, the mixed solution of copper sulfate and potassium dichromate (or copper sulfate and potassium permanganate) can simultaneously observe the migration of the two ions of yin and yang, and the phenomenon is obvious. Only one type of copper sulfate or potassium permanganate is used more than usual. The effect of the solution for ion migration experiments is good. I. Instrument The instrument used in this experiment is a U-shaped tube made by using organic glass plates. (The schematic diagram of the instrument and its detailed production method are described in this publication, 1980.)