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现行教材各版本对“空气中氧气体积分数的测定”这一实验,几乎采用相同的设计方式,该装置不乏许多优点,但也有不少缺陷未能避免,如:实验操作要求高、产生误差原因多等。在总结前人及教参的基础上,通过多次实践检验,设计了一种更科学合理的装置(见正文)。设计中,创造性地使用了量筒和注射器,在实验过程中可以快速方便地读取数据;又用蓝色Cu SO4溶液替代水,不仅使实验现象更加明显,同时还能化解剩余白磷的毒性,可谓一举两得。从分析教材实验入手,参照分析其他教学参考资料的改进安排,并结合教学实践,总结出具有一定创新的实验设计。
The current version of the textbook on the “Determination of oxygen in the air volume fraction ” This experiment, using almost the same design, the device has many advantages, but there are many shortcomings can not be avoided, such as: high experimental requirements, resulting in More error causes. On the basis of summarizing the predecessors and teaching parameters, we have designed a more scientific and reasonable device through multiple practical tests (see the text). Design, the creative use of measuring cylinders and syringes, the experimental process can be quickly and easily read the data; and blue Cu SO4 solution instead of water, not only the experimental phenomenon more obvious, but also to resolve the toxicity of the remaining white phosphorus can be described Kill two birds with one stone. Beginning with the analysis of teaching materials experiment, referring to the analysis of other teaching reference material improvement arrangements, combined with teaching practice, summed up with some innovative experimental design.