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高中部分(补充) (1)用粉笔灰制造熟石膏粉将粉笔灰加水浸泡几天,再把它磨细,滤去水,晒干,放铁锅(铝锅)中焙炒。炒至120℃以上时,生石膏粉即分解放出水蒸气,体积变大并呈现流体状态,一直炒至体积回缩,失去流体状态为止(不超过170℃)。将所得熟石膏粉加水调成糊,不久即凝成硬块。 (2)用铵盐和消石灰制取氨气实验中可以用生石灰粉末代替消石灰,此时制得的氨气比较干燥。试管中应衬放卷烟中的铝箔,否则试管极易损裂。贴在铝箔上的薄纸,只要用水
High school part (Supplementary) (1) The plaster powder is made of chalk and ash. The chalk dust is soaked in water for a few days, then finely ground and filtered to remove water, dried and roasted in an iron pan (aluminum pan). Speculation to 120 ℃ above, the gypsum powder that is decomposed release water vapor, the volume becomes larger and fluid state, has been scaled to the volume contraction, loss of fluid state so far (no more than 170 ℃). The resulting plaster powder plus water into a paste, soon condensed into lumps. (2) Ammonia from ammonium salt and hydrated lime In the experiment, quick lime powder can be used instead of hydrated lime, and the ammonia produced at this time is relatively dry. Tube should be lined with cigarettes in the aluminum foil, or tube easily broken. Paper attached to the foil, as long as water