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中学化学实验经常要用到大量的澄清石灰水,实验室通常的制取方法为:先配制氢氧化钙饱和溶液,再用普通玻璃漏斗过滤,或静置后直接倾倒,得到澄清溶液。该方法的缺点是:倾倒时易将底部氢氧化钙固体倒出。于是,有学者开发出以下新装置:采用打气加压的方法使石灰水流出,但打气费劲;采用气门芯虹吸法吸出石灰水,但易污染洗耳球;直接采用下口瓶,但需要自制玻璃弯管,工艺操作困难。对于过滤的方法,很多人认为过程漫长。其实,
High school chemical experiments often require a lot of clarification of lime water, laboratory preparation methods are usually: first preparation of saturated calcium hydroxide solution, and then filtered through an ordinary glass funnel, or directly after pouring to give a clear solution. The disadvantage of this method is that it is easy to pour out the bottom calcium hydroxide solid when pouring. As a result, some scholars have developed the following new devices: the use of cheer pressure pressurized lime water outflow, but pumping effort; the use of valve core siphon suction lime water, but easy to clean the ear wash ball; direct use of the mouth bottle, but need to self-made Glass elbow, process operation difficult. For the filtering method, many people think that the process is long. in fact,