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例题为了证明铜与稀硝酸反应产生一氧化氮,某校同学设计了一个实验,其装置如图1所示(加热装置和固定装置均已略去).A为注射器,B为两端长短不等的U形管,C是装有NaOH溶液的烧杯,D处是绕成螺旋状的铜丝,K1、K2是止水夹(1)装置气密性的检查方法为.(2)实验时,为在D处收集到NO,以便观察颜色,必须事先在A中吸入一定量的空气.然后K1(“关闭”或“打开”),从U形管左端注入稀硝酸,
Example In order to prove that nitric oxide is produced by the reaction between copper and dilute nitric acid, an experiment was designed by a fellow of a certain school whose device is shown in Figure 1. (A heating device and a fixing device have been omitted.) A is a syringe, B is short , Etc., U is a U-shaped tube, C is a beaker containing NaOH solution, D is wound into a spiral copper wire, and K1 and K2 are water stop clips. (1) , In order to collect NO at D for color observation, a certain amount of air must be ingested prior to A. Then K1 (“off” or “on”), dilute nitric acid is injected from the left end of the U-