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首先,使锥形瓶充满红棕色的二氧化氮气体,塞上欢孔橡皮塞。然后,取几小块木炭放入坩埚中烘烤一下,(烘烤的目的是赶走木炭多孔
First, fill the Erlenmeyer flask with red-brown nitrogen dioxide gas and plug it with a rubber stopper. Then, take a few pieces of charcoal and bake them in a pot. (The purpose of baking is to remove the porous charcoal.