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在传统的化学教学实验中,气体一般需要现制现用。气体收集一般采用集气瓶,集气瓶内的气体只能一次性使用。在教学中,可采用气体采样袋配合注射器改进氨的3个实验:喷泉实验、氨与盐酸实验、氨与硫酸亚铁实验。一次制一袋氨气,可多次使用。每次实验,气体用量小,且没有有毒的氨气挥发出来,有利于开展学生分组实验。气体采样袋价格便宜,使用方便,在中学化学实验中有着广泛的应用前景,可用于Cl_2,SO_2,NH3多种气体的化学性质探究。
In traditional chemistry teaching experiments, the gas generally needs to be used now. Gas collection generally use gas collection bottle, gas collection bottle can only be used once. In teaching, gas sampling bags can be used to improve the ammonia syringe with three experiments: fountain test, ammonia and hydrochloric acid experiments, ammonia and ferrous sulfate experiment. A bag of ammonia, can be used repeatedly. For each experiment, the amount of gas used is small, and no toxic ammonia volatilizes, which facilitates the grouping of students. Gas sampling bag is cheap and easy to use. It has wide application prospect in high school chemistry experiments and can be used to explore the chemical properties of a variety of gases such as Cl_2, SO_2 and NH3.