为了探究分子的运动这一性质,化学课上,杨老师做了一个有趣的实验(如图):在烧杯A中装入20mL蒸馏水,滴入2滴～3滴酚酞试液,观察到所得溶液是无色的;在B烧杯中装入10mL浓氨水。用一只大烧杯将A、B两个小烧杯罩在一起。几分钟后,奇妙的现象出现了:小烧杯A中的溶液变成了红色!教室里立刻沸腾起来。看着同学们异常激动的表情,小苏提出了问题,“小烧杯A中的溶液为什么会变红啊?”“肯定是B烧杯中浓氨水的分子运动到了A烧杯中,与A烧杯中的酚酞试液接触,使其变红了。”直言快 In order to explore the nature of the movement of molecules, Yang made an interesting experiment in chemistry class (pictured): 20 mL of distilled water was filled in a beaker A, and 2 drops to 3 drops of phenolphthalein solution were dropped. The resulting solution was observed Is colorless; B beaker filled with 10mL concentrated ammonia. With a large beaker A, B two small beaker cover together. A few minutes later, the fantastic phenomenon appeared: the solution in the small beaker A turned red! The classroom immediately boiled. Looked at the students excited expression, Su raised a question, “Why the solution in a small beaker A becomes red? ” “” B beaker is certainly concentrated ammonia molecules move to A beaker, and A The phenolphthalein solution in the beaker comes in contact, turning it red. "