小学自然第十册的《二氧化碳》一课，要求是先用实验方法制取一些二氧化碳气体以备课中的实验用。这个制取方法是在一个广口瓶内放入碱粉和醋，两者就立刻发生剧烈的化学反应，同时放出二氧化碳气体，再用导管和集气瓶收集。这个制取方法由于广口瓶不大，又不能放入太多的碱和 In the “Elements of CO2” lesson in the 10th grade of the elementary school, the requirement is to first prepare some carbon dioxide gas for experimental use in the course. The method of preparation is to put alkaline powder and vinegar in a wide-mouth bottle, and both of them immediately undergo a violent chemical reaction, emit carbon dioxide gas, and then collect it with a pipe and a gas cylinder. This preparation method is not large jars and can not put too much alkali and