铜与稀硝酸反应是高中化学必做实验之一。教材原有的铜与稀硝酸反应实验装置简单,理论上应生成无色NO气体,在试管口与空气反应变为红棕色。然而,在实际操作中,由于试管内不可避免地存在空气,生成的NO气体在试管内马上就变色,看不见无色的NO气体。为此,对该实验进行适当的改进,可以使实验操作简单,现象明显,环保无污染。 Copper and dilute nitric acid reaction is one of the high school chemistry must do experiment. Textbook original copper and dilute nitric acid reaction experimental device is simple, in theory, should generate colorless NO gas, test tube mouth and air reaction into reddish brown. However, in practice, due to the unavoidable presence of air in the test tube, NO gas generated immediately discolored in the test tube, and no colorless NO gas was seen. To this end, the appropriate experiments to improve the experimental operation can be simple, the phenomenon is obvious, environmentally friendly pollution-free.