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制取氢气时，证明生成的液体中有硫酸锌存在，教材采用了蒸发的方法，用时比较长；如果锌与硫酸反应的时间短，效果不明显。针对此项不利，总结多年教学经验，对该实验进行了改造，把蒸发实验改为灼烧实验。ａ．制作。取直径为１ｍｍ长２５ｃｍ左右的铜丝（或铁丝），在前端用
When hydrogen was produced, it was proved that zinc sulfate was present in the produced liquid. The textbook used the method of evaporation, which took a long time; if the reaction time of zinc and sulfuric acid is short, the effect is not obvious. For this disadvantage, summarizing years of teaching experience, the experiment was modified to change the evaporation experiment to a burning experiment. a. Production. Take a copper wire (or wire) with a diameter of 1mm and a length of about 25cm.