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高中化学课本第一册中铜与硝酸反应演示实验 ,是直接将铜片浸入硝酸中 ,这样的操作污染环境 ,教室内飘散着刺激性ＮＯ2气体 ,实在无法时 ,教师只得将试管拿到教室外。为克服弊端 ,我以此实验操作做了改进。取一支干燥管 (指定粗端为进口管 ,小端为出口管 ) ,从容器底到出口管量
The demonstration experiment of the reaction between copper and nitric acid in the first volume of the high school chemistry textbook is to immerse the copper sheet directly in nitric acid. This operation pollutes the environment and the classroom emits irritating NO2 gas. When it is impossible, the teacher has to take the test tube outside the classroom. . In order to overcome the drawbacks, I made improvements with this experimental operation. Take a dry tube (designate the thick end as the inlet tube and the small end as the outlet tube) from the bottom of the container to the outlet tube