本刊1988年第2期刊登的《证实浓硫酸具有吸水性的演示实验》一文,设计精巧.但作为演示实验感到有如下几点不足:①需时较长②没有对照实验,不易使学生信服③可见度较差.若用学生熟悉的CuSO_4?5H_2O来做演示,会得到意想不到的效果. The article titled “Demonstration Experiment for Confirming the Absorption of Concentrated Sulfuric Acid,” published in the 2nd issue of the magazine in 1988, is well-designed. However, as a demonstration experiment, there are the following deficiencies: 1 It takes a long time 2 There is no controlled experiment, and it is not easy for students to be convinced 3 The visibility is poor. If you use the familiar CuSO_4?5H_2O to do the demonstration, you will get unexpected results.