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用一支大试管,管口略向上,底部放氯酸钾1.5克(约一满匙),中部放二氧化锰0.3克(约半平匙)。装置如下图:
With a large test tube, the nozzle is slightly upwards, with 1.5 grams of potassium chlorate at the bottom (about one full spoon) and 0.3 grams of manganese dioxide in the middle (about half a spoon). The device is as shown below: