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现行教材中的钠在氯气中燃烧演示实验,按课本上的方法来进行,有三个缺点:(1)实验用的铁制或铜制的燃烧匙,在剧烈的燃烧中会参与反应生成棕黄色或棕色的烟(氯化铁、氯化铜微粒),干扰实验现象;(2)先引燃钠块再伸进盛氯气的集气瓶里。前后现象变化不明显;(3)反应过程中,氯气易扩散。本文介绍一种简单易行、现象明显、无污染的实验方法。
The demonstration experiment of sodium burning in chlorine in the current textbooks is carried out according to textbooks. There are three shortcomings: (1) Iron or copper burner spoons used in experiments, which will participate in reactions during intense combustion to generate brown and yellow Or brown smoke (ferric chloride, copper chloride particles) interferes with the experimental phenomenon; (2) first ignite the sodium block and then extend it into a chlorine collection cylinder. Before and after the phenomenon does not change significantly; (3) During the reaction, chlorine is easy to diffuse. This article describes a simple, obvious, non-polluting experimental method.