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实验室制取盐酸及盐酸浓度的测定一、制取稀盐酸:将10克固体食盐(已称好)放在100毫升蒸馏瓶中,瓶口装上50毫升滴液漏斗,检查气密性,然后支管口接一漏斗,并放在400毫升烧杯中,烧杯中装有150毫升蒸馏水(注意漏斗口紧贴水面,切勿伸入水中)。滴加浓硫酸15毫升,当气体发生缓慢时,用酒精灯加热(烧瓶底垫一块石棉网),经3—5分钟后,停止加热。再经3—5分钟,发生器已停止反应,取出漏斗,烧杯内的盐酸转入250毫升容量瓶内,用蒸馏水洗烧杯二次,然后稀释到刻度。
Laboratory preparation of hydrochloric acid and hydrochloric acid concentration determination First, the preparation of dilute hydrochloric acid: 10 grams of solid salt (already known) placed in a 100 ml distillation flask, bottle mouth mounted on 50 ml dropping funnel, check the air tightness, Then the branch pipe is connected to a funnel and placed in a 400 ml beaker. The beaker contains 150 ml of distilled water (note that the funnel mouth is close to the water, and do not reach into the water). Concentrated sulfuric acid (15 ml) was added dropwise. When the gas generation was slow, the lamp was heated (the flask bottom was covered with a asbestos mesh). After 3-5 minutes, the heating was stopped. After another 3-5 minutes, the generator has stopped reacting, and the funnel is taken out. The hydrochloric acid in the beaker is transferred into a 250 ml volumetric flask. The beaker is washed twice with distilled water and then diluted to the mark.