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装置如下图。 试管A中装入约占试管体积1/3左右的NaHCO_3粉末,洗气瓶B 装入浓H_2SO_4,以除去反应中产生的水蒸汽,二通管C中装满沾上Na_2O_2粉末的脱脂棉,管口再塞入一些干净脱脂棉,以保证气体能顺利通过,同时增大Na_2O_2和CO_2的接触面积,洗气瓶D装入浓的NaOH溶液,用于吸收未来得及反应的CO_2。用排水法收集氧气。
The device is as shown below. In the test tube A, about 1/3 of the volume of the test tube is filled with NaHCO 3 powder. The wash gas bottle B is filled with concentrated H 2 SO 4 to remove water vapor generated during the reaction. The two-way tube C is filled with cotton wool soaked with Na 2 O 2 powder. The mouth is then stuffed with some clean absorbent cotton to ensure that the gas can pass smoothly, and the contact area between Na2O2 and CO2 is increased. The scrubbing cylinder D is filled with a concentrated NaOH solution for absorbing the CO2 that is not available in the future. Drainage is used to collect oxygen.