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Add 100-150g of finely crushed ice and stir until the m-nitroaniline has been converted into the sulphate and a homogeneous paste results. Cool to 0-5°C by immersion of the beaker in a freezing mixture, stir mechanically and add a cold solution of 18g(0.26mol) of sodium nitrite in 40 ml of water over a period of 10 minutes until a permanent colour is immediately given to potassium iodide-starch paper: do not allow the temperature to rise above 5-7°C during the diazotisation.
加入100-150g碎冰,搅拌至m-硝基苯胺成硫酸盐,把烧杯浸入到冷冻液中冷却到0-5°C,机械搅拌下于 10 min内加亚硝酸钠冷溶液(由18g(0.26mol)亚硝酸钠和40 ml 水组成),直到用淀粉-碘化钾试纸测试时,能使该试纸立即显色且不褪色:在重氮化反应时不允许温度超过5-7°C。
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bismuthine bisulphate:重硫酸盐
biradical 双自由基,双游离基 | bismuthine bisulphate 重硫酸盐 | bisulphite 重亚硫酸盐
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bisulphate:重硫酸盐
bisulfite 重亚硫酸盐 | bisulphate 重硫酸盐 | bisulphide 二硫化物