欧洲药典冰醋酸鉴别?EP中 冰醋酸 的鉴别有一项是:取0.03ml冰醋酸,加水3ml,加稀 氢氧化 钠调至中性,再依次加入硝酸镧溶液,碘溶液和氨水,煮沸后放置几分钟,会出现蓝色沉淀或者深蓝色溶液。To 0.03 ml add 3 ml of water and neutralise withdilute sodium hydroxide solution. Add successively 0.25 ml of lanthanum nitratesolution, 0.1 ml of 0.05 M iodine and 0.05 ml of dilute ammonia. Heat carefullyto boiling. Within a few minutes a blue precipitate is formed or a dark bluecolor develops.最近一直做不出来,加碘后就是浅棕色溶液,加氨水也是浅棕色,煮沸后颜色变淡,接近无色。1.重配硝酸镧和碘,还是不行;2.用这组试剂做 醋酸钠 的鉴别,现象很明显,有蓝色沉淀;3.拿自己买的冰醋酸也做了下,也没有出现蓝色沉淀或溶液;查看更多6个回答 . 5人已关注