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二、演示方法方法一用常见的制气方法制取NH_3和HCl产生白烟:各取豆粒大已研细的NH_4Cl和Ca(OH)_2粉末,在纸片上混匀后放入干燥的大试管中,在小试管中加入豆粒大NaCl,在滴管中吸入浓H_2SO_4,如上图装置好并固定在铁架台上。演示时,向上抽动玻璃管,带动小试管上移,加入几滴浓H_2SO_4后使小试管下移到大试管底部。给大试管加热,立即产生白烟并充满整个大试管。冷后,大试管内部各处均挂一层白霜。
2. Demonstration Methods Method 1 Prepare NH 3 and HCl using the common gas preparation method to produce white smoke: Take each of the well-grown NH 4 Cl and Ca(OH) 2 powders, mix them on the paper, and place them into large dry test tubes. In the test tube, add large NaCl to the beans and inhale concentrated H_2SO_4 in the dropper, as shown in the figure above and fix it on the iron stand. During the demonstration, the glass tube was traversed upward and the small test tube was moved upward. A few drops of concentrated H 2 SO 4 were added and the small test tube was moved to the bottom of the large test tube. Heating a large test tube produces white smoke immediately and fills the entire test tube. After cold, a large amount of hoarfrost hangs inside the large test tube.