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初中化学中有关溶解度计算,既是重点,又是难点,概念性强,计算内容多,特别是求某一温度下的溶解度、饱和溶液蒸发溶剂或降低温度析出晶体,原饱和溶液在增加溶剂或升高温度的条件下再达饱和应增加溶质量等计算,学生感到难解,我在近几年的教学中坚持从概念出发,运用关系式解法,收到较好的效果。
Solubility calculation in junior high school chemistry is both important and difficult. It is conceptually strong and contains many calculations. In particular, it requires the solubility at a certain temperature, the saturated solution to evaporate the solvent, or the lower temperature to precipitate crystals. The original saturated solution increases the solvent or liter. Under the condition of high temperature, the saturation should be increased and the solution quality should be increased. The students find it difficult to solve. In my teaching in recent years, I insisted on starting from the concept and using the relational solution method to receive good results.