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在北师大版的《义务教育课程标准实验教科书》七年级下册中 ,“维生素C的检测”演示实验 :是利用吲哚酚试剂遇维生素C能褪色 ,遇清水不褪色的原理来进行维生素C的检测的。但“吲哚酚”既昂贵又很难买到。为此我做了如下改进 :1 材料的改进用质量浓度为 0 2g·L- 1 的高锰酸钾
In the Beijing Normal University’s “Gradebook of Experimental Courses for Compulsory Education Standards,” in the seventh grade, the “Vitamin C Detection” demonstration experiment is to use vitamin E in the case of indophenol reagents to fade, and the principle of water does not fade in order to carry out vitamins. C detected. However, “indophenol” is both expensive and difficult to buy. To this end, I made the following improvements: 1 Improvements in the use of potassium permanganate with a mass concentration of 0 2g·L-1