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(一)上海卫生干部学校曹存启同志,对本报1954年10月号“中学化学课本里的几个演示实验”文内,有关氨燃烧实验提出改进,他指出:该文的插图存在一些问题:加氧发生器的试管口向上和铁夹夹在试管中央的位置,都是值得研究的。(试管口应向下倾斜,铁夹应夹在试管上部的三分之—,不可夹在试管的中央。) 作这个实验时,便发现氨在氧中燃烧易使玻璃筒发生破裂便改变了装置来克服这个困难,操作如下: 仪器装置如图,在125毫升的圆底烧瓶中,盛
(1) Comrade Cao Cunqi of the Shanghai Health Cadre School mentioned improvements to the ammonia combustion experiment in his article entitled “Several Demonstration Experiments in the Chemistry Textbook for Secondary Schools” in October 1954, and pointed out: There are some problems in the illustration of the article: Oxygen generator test tube mouth up and clamp the tube in the center of the position, are worth studying. (Test tube mouth should be tilted downward, iron clip should be caught in the upper third of the test tube, not in the center of the tube.) For this experiment, we found that ammonia in the combustion of oxygen easy to make the glass tube rupture will change Device to overcome this difficulty, the operation is as follows: The device as shown in Figure, in a 125 ml round bottom flask, Sheng