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NaOH 与 CO_2反应的实验在初中化学教材中没有要求,为了激发学生的学习兴趣,《教师教学用书》建议增做一个实验(图1)。这个实验能形成美丽的红色喷泉,现象明显、有趣,但这个实验存在一定的不足,如每收集一瓶 CO_2只能进行一次实验,且无法检验反应的产物。为此,笔者对该实验进行了改进(图2),在保留实验有趣和现象明显的特点的同时,操作更简单,且收集一瓶 CO_2后可重复进行实验,减少了每做一次实验都要收集 CO_2的麻烦。
The experiment of the reaction between NaOH and CO 2 is not required in the junior high school chemistry textbook. In order to stimulate students’ interest in learning, the “Teacher’s Book” suggests adding an experiment (Figure 1). This experiment can form a beautiful red fountain. The phenomenon is obvious and interesting. However, there are certain deficiencies in this experiment. For example, only one experiment can be performed for each bottle of CO 2 collected, and the product of the reaction cannot be tested. For this reason, the author has improved the experiment (Figure 2). While retaining the interesting and obvious features of the experiment, the operation is simpler, and after collecting a bottle of CO_2, the experiment can be repeated, reducing the need for every experiment. Collect CO_2 troubles.