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浓度配制问题是应用题中的一类典型题,要求学生掌握,但历来学生感到困难.本文介绍一种行之有效的方法——“杯子法”,其方法如下:1.设未知数.一般问什么设什么.2.根据配制情况画杯子.3.将每种溶液的浓度及质量分别标在对应的杯子
Concentration formulation is a typical problem in the application of questions, requiring students to master, but has always been difficult for students. This article describes a proven method - “cup method”, the method is as follows: 1. Set the unknown. General ask What is set? 2. Draw cups according to the preparation situation. 3. Label the concentration and quality of each solution in the corresponding cups.