《溶液的酸碱性》是初三化学教学中的一个重要知识点,虽然这不是知识技能目标中的难点,但是它是后续的酸碱盐教学内容的基础,也是很多化学实验探究的工具。初三化学新教材要求我们从过去单纯的落实化学知识与技能目标转变为三维目标的多角度落实。这个要求促使我努力改变过去的两个教学习惯,一是只向学生呈现“裸露”的知识,而没有将它“包装”起来。换言之就是要注重情境创设。二是习 “Acid and base of solution” is an important knowledge point in junior high school chemistry teaching. Although this is not a difficult task in knowledge and skill target, it is the basis of subsequent teaching of acid-base salt and also a tool to explore many chemical experiments. The new third-year chemistry textbooks require that we implement from the simple implementation of the goal of transforming chemical knowledge and skills into a three-dimensional goal in the past. This requirement prompted me to work hard to change the past two teaching habits, one is only to show students “naked ” knowledge, without it “packing ” up. In other words, we must pay attention to the situation creation. Second, learning