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1.实验室制取氢气时,为什么必须先检验装置的气密性,并证明装置不漏气后方可加入锌粒和稀硫酸?答:因为若加入药品发生反应后,才发现装
1. When making hydrogen in the laboratory, why must first check the airtightness of the device and prove that the device does not leak gas before adding zinc particles and dilute sulfuric acid? A: Because if you join the drug after the reaction, only to find the