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化学是一门实验性很强的学科,但由于缺少化学药品,一些农村中学往往不能进行必要的学生实验。为了解决缺少药品的问题,我们采取了如下一些做法。一、以粗代精。近年来我们到附近工厂商购不少工业盐酸和工业硫酸,供学生用于制H_2、CO_2、H_2S、Cl_2、CH_2=CH_2等气体。这些工业盐酸和硫酸,虽然浓度和纯度略低于试剂盐酸和硫酸,但实验效果都基本上相同,而成本只有后者的十分之
Chemistry is a very experimental subject, but due to the lack of chemicals, some rural middle schools are often unable to carry out the necessary student experiments. In order to solve the problem of lack of drugs, we have adopted the following practices. First, rough generation is fine. In recent years, we have purchased a lot of industrial hydrochloric acid and industrial sulfuric acid from nearby factories for students to use for the production of H2, CO2, H2S, Cl2, CH2=CH2 and other gases. These industrial hydrochloric acid and sulfuric acid, although the concentration and purity are slightly lower than the reagent hydrochloric acid and sulfuric acid, but the experimental results are basically the same, and the cost is only a tenth of the latter