在中学教材里有下列内容:水的电离,氢离子的浓度,氢指数pH值,测定pH值的方法和实际意义。教学这些内容一定要能跟实际测定溶液的pH值联系起来。但是目前很多中学没有测定pH值的仪器,因而对学生巩固和加深理解课本内容缺乏感性认识。这里我们给中学教师介绍一种能够自力更生制作的测定pH值的装置。 In the middle school textbooks, there are the following contents: ionization of water, concentration of hydrogen ions, hydrogen index pH, method of measuring pH, and practical significance. Teaching content must be linked to the actual determination of the pH of the solution. However, many middle schools do not have instruments for measuring pH, so they lack understanding of the students’ understanding of the contents of textbooks. Here we introduce to middle school teachers a device that can be self-reliant for measuring pH.