论文部分内容阅读
高中化学人教版新课标必修1实验1-1粗盐的提纯中涉及了过滤、蒸发、结晶等基本的分离提纯操作,同学们在分析、解答涉及物质的分离提纯问题时,特别是在遇到结晶问题时,错误率往往较高,因而有把相关内容再好好梳理一下的必要。例题图1为NaCl和KNO_3固体的溶解度曲线,根据该图回答下列问题:(1)如何从NaCl溶液中获得NaCl晶体?(2)如何从KNO_3溶液中
High School Chemistry PEP New Curriculum Required 1 Experiment 1-1 The crude salt purification involves filtering, evaporation, crystallization and other basic separation and purification operations, students in the analysis, answer the separation of substances involved in the purification problem, especially in the Encountering a crystallization problem, the error rate is often higher, so there is a need to sort out the relevant content better again. Example 1 Figure 1 shows the solubility curves of NaCl and KNO 3 solids. Based on this figure, the following questions are answered: (1) How to obtain NaCl crystals from NaCl solution? (2) How to obtain NaCl crystals from KNO 3 solution