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在中学化学课本里,演示实验和学生实验所使用的试液,大多数没有注明浓度求。这说明在这些实验中,对溶液的浓度要求并不十分严格。但有的实验得不到预期的效果,查原因是因为浓度不当所致,这又说明,对溶液的浓度有一定的要求。那么中学化学实验中,常用的酸、碱、盐及指示剂等溶液的浓度究竟以多大为宜?这些浓度的溶液该怎样配制呢?笔者根据查阅的有关资料和教学实践谈几点看法。
In high school chemistry textbooks, most of the test liquids used in demonstration experiments and student experiments did not indicate concentration requirements. This shows that in these experiments, the concentration requirement for the solution is not very strict. However, some experiments did not achieve the desired results. The reason for the investigation was due to improper concentration, which in turn indicated that there was a certain requirement for the concentration of the solution. In the middle school chemistry experiment, what is the concentration of commonly used solutions such as acids, alkalis, salts, and indicators? How do these concentrations of the solution be formulated? The author discusses several opinions based on the relevant information and teaching practice.