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一、说明分子运动和化学变化的实验将杯底内壁贴有被水润湿的酚酞试纸的太烧杯,先罩在盛浓氨水的小烧杯上,看到贴在杯底的酚酞试纸变成红色;再将上述大烧杯罩在盛浓盐酸的小烧杯上,看到已变红色的酚酞试纸重又变成白色,大烧杯内还有白烟生成。此实验说明了 NHs 分子与 HCl 分子的运动,以及 NH_2与试纸中的水作用:
First, the experiment of molecular motion and chemical changes The bottom of the cup was affixed to the wall wetted phenolphthalein test paper too beaker, the first cover in a small concentration of ammonia in a small beaker, the phenolphthalein test paper attached to the bottom of the cup turns red ; Then the large beaker covered in concentrated hydrochloric acid small beaker, see the red phenolphthalein test paper again become white, there are white beakers inside the beaker. This experiment illustrates the movement of NHs molecules and HCl molecules and the effect of NH2 on the water in test strips: