中师课本《化学》第一册[实验6—7]改进。 把浓硝酸2毫升左右,同一小块木炭一起放在大试管(或圆底烧瓶)里加热。观察到红棕色的气体生成和澄清石灰水变浑浊的实验现象。从而证明了木炭被氧化成二氧化碳、浓硝酸被还原成二氧化氮。同时还避免了有毒气体的逸出。 In the textbook “Chemistry” of the teacher’s book, Experiment 1 was improved [Experiment 6-7]. Concentrate about 2 ml of concentrated nitric acid and heat the same small piece of charcoal in a large test tube (or round bottom flask). Red-brown gas formation and clear lime water turbidity were observed experimentally. It is thus demonstrated that charcoal is oxidized to carbon dioxide and concentrated nitric acid is reduced to nitrogen dioxide. At the same time also avoid the escape of toxic gases.