酸碱中和滴定实验时，滴定管尖端的气泡必须赶出，否则就会增大实验误差。酸式滴定管尖端气泡的赶出，一般的方法是：先关闭活塞，往酸式滴定管中加入少量溶液；然后将酸式滴定管稍微倾斜，开启活塞，溶液下流，将气泡逐之流出。笔者曾以此方法做过多次实验，效果不佳，活塞下 In the acid-base neutralization titration experiment, the bubbles at the tip of the buret must be driven out, otherwise it will increase the experimental error. The ejection of bubbles from the tip of an acid burette is generally accomplished by first closing the piston and adding a small amount of solution to the acid burette; then tilting the acid burette slightly to open the piston and allowing the solution to flow out of the bubble. The author has done many experiments in this way, the effect is not good, under the piston