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一、吸水性在两个?=10cm的培养皿中,分别放入浓硫酸和稀硫酸各约1/4容积.另取两个同样大的表面皿,先在其凸面上滴一点油并用布擦匀(有利于水汽凝成小水珠),再把它放在盛有沸水的保温杯口上方,使水汽凝于凸面上形成一薄层小水珠.然后立即分别放在上述两个培养皿上(凸面朝下),半分钟后可以看到,浓硫酸上方的水珠逐渐消失,而稀硫酸上方的水珠无明显变化,对比说明浓硫酸有吸水性.
First, water absorption in two ? = 10cm petri dishes, respectively, put concentrated sulfuric acid and dilute sulfuric acid each about 1/4 volume. Another two equally large watch glass, first on its convex surface, a little oil and cloth Rub it evenly (in favor of condensation of water vapor into small droplets), place it on top of the boiling cup holding the boiling water, so that water vapour condenses on the convex surface to form a thin layer of water droplets. Then immediately place the above two cultures, respectively. Dish (convex side down), half a minute later you can see, the water droplets above the concentrated sulfuric acid gradually disappeared, and no significant changes in the water above the dilute sulfuric acid, the contrast shows that the concentrated sulfuric acid has water absorption.