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“二氧化碳与水反应”实验是初中化学人教版教材的一个重要实验。利用4朵染有紫色石蕊的干燥纸花探究干燥的二氧化碳不能使紫色石蕊变红,而二氧化碳与水反应生成的碳酸能使紫色石蕊变红。实验过程如图1所示。该实验设计很有说服力,但按照教材进行实验操作,尚存在以下不足:(1)实验分4次进行,操作复杂,容易让学生晕头转向,实验对比不明显。(2)该实验使用集气瓶收集二氧化碳,需制取的二氧化碳气体的量比较
“Carbon dioxide and water reaction ” experiment is an important experiment of Junior High School Chemistry PEP. The use of four dried paper flowers stained with purple litmus to explore the dry carbon dioxide can not make the purple litmus turn red, and the reaction of carbon dioxide and water can make the purple litmus red. Experimental process shown in Figure 1. The experimental design is very convincing, but in accordance with the experimental teaching materials, there are still the following deficiencies: (1) The experiment was divided into 4 times, the operation is complicated, easy to make students confused, experimental contrast is not obvious. (2) In this experiment, using a gas collection bottle to collect carbon dioxide, the amount of carbon dioxide gas to be produced is compared