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由金属和浓HNO_3作用制取NO_2时,往往不易控制NO_2发生的量,而NO_2是有毒气体,不宜过多的散布于空中。为避免此弊害可用下述方法制取:(如图1)蒸馏烧瓶中盛浓HNO_3,瓶口用由铁丝贯穿的橡皮塞塞紧,铁丝可上下移动,铁丝下端钩着一根浸有石蜡的细绳,绳的另一端穿着铜片(或挷着铜丝),当铁丝下移时铜与HNO_3接触即产生NO_2,上移则铜与HNO_3脱离NO_2停止发生。〔铁丝穿过橡皮的方法可先用穿孔器打去一部份(图2),然后插入铁丝(也可烧红后插入)以容易滑动而不漏气为度。穿孔器打入橡皮塞后,为使打下的橡皮易于取出,可再打入另一更小的穿孔器,然后将二穿孔
It is not easy to control the amount of NO 2 generated when NO 2 is made by the action of metal and concentrated HNO 3, while NO 2 is a toxic gas, which should not be dispersed in the air too much. To avoid this harm can be obtained by the following method: (Figure 1) Distillation flask filled with concentrated HNO_3, the bottle mouth with a rubber stopper plugged through the wire, the wire can move up and down, hook the hook wire with a paraffin The other end of the rope is clad in copper (or copper wire). When the wire moves downwards, the contact of copper with HNO_3 produces NO_2. When it moves upward, the separation of copper from HNO_3 from NO_2 stops. [Iron wire through the rubber method can be used to punch part (Figure 2), and then insert the wire (also can be red after the injection) to easily slide without leakage for the degree. Punch into the rubber stopper, in order to make the rubber easy to get out, you can re-enter another smaller perforator, and then two perforation