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在进行高中无机物分类,硷类一节的教学,时为了说明二氧化碳与苛性钠溶液的作用,根据通报53年1月号,对教师的指示信所介绍的演示原理,设计了这样的一个演示,操作简便,效果很好,愿意提出供大家参考。用平底大烧瓶一只。内盛满二氧化碳,并于事先在安装瓶塞上的弯管的一端,拴上一个空的气球囊,在进行实验时,于烧瓶中倾入浓氢氧化钠液10毫升左右后;很快把此塞塞紧,摇动一次,由于内部二氧化碳很快被吸收,瓶中气压降低,气球很快就涨大起来,这个现象极鲜明又清楚。此外这套装
In order to explain the role of carbon dioxide and caustic soda solution in the teaching of the high school inorganic classification and alkalinity section, a demonstration was designed based on the presentation principle presented by the teacher’s instruction letter in accordance with the January issue of January 53 , Easy to operate, the effect is very good, willing to propose for your reference. Use a flat flask with a large one. Filled with carbon dioxide and tied to an empty balloon at the end of the elbow on which the stopper was previously installed. After performing the experiment, pour about 10 ml of concentrated sodium hydroxide solution into the flask; This stuffy plug, shake once, as the internal carbon dioxide is quickly absorbed, the pressure in the bottle to reduce the balloon quickly up, this phenomenon extremely sharp and clear. In addition this suit