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【引入新课】纯碱是不是碱?盐溶液为什么显碱性?是不是所有的盐溶液都显碱性?【分组实验】请大家通过实验来观察一下盐溶液的酸碱性。【学生活动】每一小组有几瓶盐溶液,请大家用p H试纸分别检验Na2SO4、NH4Cl、Na HCO3、Na Cl、CH3COONa、Cu SO4等溶液的酸碱性。(分为两组,不同的学生做的可能不同)【学生讲述分析及实验结果】Na Cl、Na2SO4溶液呈中性,而NH4Cl、
[Introduction of a new class] Is soda ash an alkali? Why is the salt solution alkaline? Isn’t all salts alkaline? [Group experiment] Please check the acidity and alkalinity of the salt solution through experiments. [Student Activity] There are several bottles of salt solution in each group. Please use p H test paper to test the acidity and alkalinity of Na2SO4, NH4Cl, NaHCO3, NaCl, CH3COONa, and Cu SO4. (Divided into two groups, different students may do differently) [students described the analysis and experimental results] Na Cl, Na2SO4 solution was neutral, and NH4Cl,