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关于溶液浓度的计算,在化学研究、化工生产以及许多行业有关溶液的配制、检验和测定中应用甚广,因此在中学化学教学中占居着相当篇幅。多年来,中学化学教材几易其本,但对于这部分知识的教学一直采用的是文字叙述式的分步讨论计算,步骤十分繁杂,不便于应用。笔者在多年的化学教学实践中深深体会到,引导学生归纳总结一些必要的计算公式和解题思路,可以使溶液浓度的计算简便易行。下面简举几例。 溶液浓度计算一般有以下五类型题。
The calculation of the solution concentration has been widely used in chemical research, chemical production, and formulation, testing, and measurement of solutions in many industries, and therefore it occupies a considerable space in chemistry teaching in middle schools. Over the years, chemistry textbooks for middle schools have been changed for a few reasons. However, the teaching of this part of the knowledge has always been based on textual narratives. The steps are very complicated and inconvenient to apply. In the years of chemistry teaching practice, the author has deeply realized that guiding students to summarize some necessary calculation formulas and problem-solving ideas can make solution concentration calculation simple and easy. Here are a few simple examples. The solution concentration calculation generally has the following five types of questions.