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一、问题的提出中学化学中的一些教师演示实验或含有有毒气体的实验,一般不做学生分组实验。笔者通过观察普通滴管、洗气装置、固液反应装置等,浓缩研究出一种新的组合仪器——双孔毛细滴管,使其微型化、绿色化,可推广应用于学生分组实验,效果很好。二、双孔毛细滴管的制作1.主要物品:两根医用毛细管(110 mm)、玻璃管(Φ=8 mm、l=40 mm)、乳胶头1个、橡皮泥(2颗黄豆大小)、牙签2根。
First, the problem raised Some middle school chemistry teachers demonstrate experiments or experiments containing toxic gases, generally do not do the student group experiments. By observing the ordinary dropper, scrubbing device, solid-liquid reaction device, the author concentrated to study a new combination of instruments - double-hole capillary tube, making it miniaturized, green, can be extended to students in group experiments, good results. Second, the production of double-hole capillary tube 1. The main items: two medical capillaries (110 mm), glass tube (Φ = 8 mm, l = 40 mm), latex head 1, plasticine (2 soybeans size) , 2 toothpicks.