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阿佛加德罗常数的测定(单分子膜法)是最近几年来编入高一化学实验教材的一个学生定量实验。对于高中学生来讲,该实验具有一定的难度。并且通过实践发现,如果按照教材所设计的做法来测定,有一定的困难,也存在一些问题,难以得到比较满意的结果。为此,笔者做了很多次试验,对实验的方法、使用的仪器进行了摸索、改进,终于取得了比较满意的结果。得出了5.5×10~(23)—6.5×10~(23)这样比较精确的数值。学生能做到5.0×10~(23)—7.0×10~(23)的人数相当多。所有学生的实验结果都在正确数量级范围内。正因为实验难度较大,教师最好能进行示范。但按教材的操作法,教师在课堂上演示时,由于学生不能围在讲台周围,所以也
The determination of Avogadro’s constant (Monomolecular Membrane Method) is a student’s quantitative experiment that has been incorporated into the chemistry textbook of the high school chemistry in recent years. For high school students, this experiment has a certain degree of difficulty. And through practice, it has been discovered that if we measure in accordance with the teaching method, there are certain difficulties, there are also some problems, it is difficult to get more satisfactory results. For this reason, the author did a lot of experiments and tried and improved the method of experiment and the instruments used, and finally achieved satisfactory results. The more accurate figure of 5.5×10 23 -6.5 10 2 was obtained. There are a large number of students who can achieve 5.0×10 23 to 7.0 10 2 . All students’ experimental results are within the correct order of magnitude. Because of the difficulty of the experiment, teachers are better able to demonstrate. However, according to the textbook’s operation method, when the teacher demonstrates in the classroom, because the students cannot surround the podium, so