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一、卤素间置换反应取一支18×150毫米的穿底大试管,用水量出20毫升的试管容积,用橡皮筋作一标记。取两块分别沾有溴化钠和碘化钠饱和溶液的脱脂棉团,将沾有溴化钠的棉团从穿底试管上端塞入橡皮筋记号处,将沾有碘化钠的棉团从穿底试管的下端塞入,使之距溴化钠棉团约10毫米,两棉团各厚约10毫米。(注意:棉团不要太湿,以免溶液会沿着试管壁往下流淌而影响实验的效果;棉团
First, the halogen replacement reaction to take a large tube through the end of 18 × 150 mm, water volume 20 ml tube volume, with a rubber band as a mark. Take two pieces of absorbent cotton swabs each saturated with a saturated solution of sodium bromide and sodium iodide, and insert the cotton batter with sodium bromide from the top of the bottom test tube into the mark of the rubber band, and wipe the cotton swamp with sodium iodide from The bottom of the bottom tube was inserted so that it was about 10 mm away from the sodium bromide sponge, and each of the two groups was about 10 mm thick. (Note: The cotton pellets should not be too wet to prevent the solution from flowing down the walls of the tubes and affecting the experimental results;