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溶液pH计算是高中化学知识体系的重要内容之一,每位教师对其教学出发点的选择都会有不同。本人曾习惯通过对其概念字斟句酌地解读,让学生用程式化的步骤解决pH计算问题。比如,“在可以忽略水电离的情况下,溶液每稀释10倍,其pH值便增加1个单位”。学生在解题时便捷了很多,正确率也不错。但这种将知识直接结论化的教学思路有其先天的不足,那就是往往
Solution pH calculation is one of the important contents of high school chemistry knowledge system. Each teacher will have different choice of teaching starting point. I was accustomed to interpreting the concept carefully and letting students use the stylized steps to solve the problem of pH calculation. For example, “When the water ionisation is negligible, the pH is increased by 1 unit for every 10-fold dilution of the solution.” Students in the solution a lot easier, the correct rate is not bad. However, this teaching method of direct conclusion of knowledge has its inherent deficiencies, that is, often