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取碳酸钠和碳酸氢钠粉末各0. 5克(对所用盐酸来说是过量的),用纸条分别送入到两个100毫升注射器针筒的底部,固体粉末不要沾在针筒壁上,以免产生阻力,使针栓受阻不能外移,造成实验失败。再推上针栓,排尽空气,用胶帽(眼药水瓶上的胶帽)或乳胶管和弹簧夹封住注射器的细管口。把两支注射器固定在铁架台上(如第52页左下图所示)。
Take 0.5 g of sodium carbonate and sodium bicarbonate powder (excessive amount of hydrochloric acid used), and send them separately to the bottom of two 100 ml syringe barrels. The solid powder should not stick to the wall of the syringe. In order to avoid resistance, the pin plug can not be moved out, causing the experiment to fail. Push on the pin and exhaust the air. Seal the small orifice of the syringe with a plastic cap (a plastic cap on the eye drops bottle) or a latex tube and a spring clip. Secure the two syringes on the iron stand (as shown on the left bottom of page 52).