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酸碱滴定教学中的关键问题,是必须让学生认识在滴定过程中溶液P~H 值变化的规律,从而能够正确选择指示剂.但是,滴定过程中溶液P~H 值的变化是一个微观的连续变化,眼看不见.用化学方法很难把它转变成宏观的连续变化让学生观察。在过去的教学中,一般都是通过理论计算的数据绘出滴定曲线,以此让学生间接认识滴定过程中溶液酸度变化的规律.如图1和图2。
The key problem in the teaching of acid-base titration is that students must know the law of the change of P ~ H value in the titration process so that the indicator can be correctly selected. However, the change of P ~ H value during titration is a micro Continuous change, can not see the use of chemical methods is difficult to transform it into a macro continuous change for students to observe. In the past teaching, the titration curve was drawn from the theoretical calculation data, so that students indirectly understand the law of solution acidity during titration, as shown in Figure 1 and Figure 2.