稀释或浓缩改变浓度对电离平衡的影响一直是中学化学教学中的一个难点。限于中学生的知识水平,教材对这个问题只作了简单的初步的解释说明:“同一弱电解质,通常是溶液越稀,离于磁撞而结合成分子的机会越少,电离度就越大。”(高中化学第三册第32面)由于此解释比较抽象而问题又比较复杂,所以模糊不清、似懂非懂的学生大有人在。过去,在讲授这一知识时,我们还可以根据电离平衡常数加 The effect of diluting or concentrating to change the concentration on the ionization balance has always been a difficulty in chemistry teaching in middle schools. Constrained by the level of knowledge of middle school students, the textbook has only made a simple preliminary explanation for this problem: “The same weak electrolyte, usually the thinner the solution, the less chance there is to combine components from magnetic collision, and the greater the degree of ionization. ”(Section 32 of the Third Book of High School Chemistry) Because this explanation is more abstract and the problem is more complicated, there are many students who are ambiguous and seem to understand. In the past, when we taught this knowledge, we could also add