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山东省即墨市第七中学刘远忠指出:实验室制取大量纯净SO_2的问题,在一些资料中大都认为必须用浓硫酸与无水亚硫酸钠反应方可制得。其理由是“SO_2易溶于水,通常状况下,1体积水大约能溶解40体积SO_2。”另外,各资料中所绘的实验装置图其差异也颇大。那么此实验所需之硫酸的浓度须多大?不能用稀硫酸
Liu Yuanzhong, the seventh middle school in Jimo City, Shandong Province, pointed out that the problem of large quantities of pure SO 2 produced by laboratories is that, in some data, it is believed that it must be produced by reacting concentrated sulfuric acid with anhydrous sodium sulfite. The reason is that “SO2 is easily soluble in water. Under normal conditions, 1 volume of water can dissolve about 40 volumes of SO2.” In addition, the differences in the experimental device diagrams drawn in the data are considerable. What is the concentration of sulfuric acid needed for this experiment? Do not use dilute sulfuric acid