乙醇和金属钠反应的实验改进

Experimental Improvement of Reaction between Ethanol and Sodium Metal

乙醇和金属钠的反应是高中化学必修2实验教学的一个重要实验,实验简单,但是按书本来做成功率不高。成功的实验体验,能充分调动学生多种感官参与,最大限度激发学习的热情。通过使用球形干燥管(内填充无水氯化钙、吸附了酸性重铬酸钾的棉花或硅胶)、小烧杯和注射器针头组合的实验装置和对反应物金属钠的前处理两方面对教材中的实验加以改进。实验证明,改进后的实验现象明显,符合预期,操作简单、安全、高效。

The reaction between ethanol and sodium metal is an important experiment in experimental teaching of chemistry compulsory 2 in senior high school. The experiment is simple,but the successful rate by book is not high. The successful experimental experience can fully mobilize the students multiple senses and stimulate their enthusiasm for learning to the greatest extent. The experiment in the textbook was improved by using a spherical drying tube (filled with anhydrous calcium chloride,cotton or silica gel that adsorbed acid potassium dichromate ),a combination of a small beaker and a syringe needle,and the pretreatment of the reactant sodium metal. The experiment proved that the improved experiment phenomenon was obvious and in line with the expectation,and the operation was simple,safe and efficient.