取两张滤纸条,分别滴上饱和的溴化钠溶液和碘化钠饱和溶液,依次将它们在敞口的氯水瓶口熏一下;滴溴化钠的滤纸呈现出溴的棕红色,并可嗅到溴的气味;滴上碘化钠的滤纸条呈现出棕黑色碘的颜色,并有金属光泽。再将已置换出溴的滤纸条与另一张滴上碘化钠溶液的滤纸条接触,立即可置换出 Two strips of filter paper were dropped on saturated sodium bromide solution and saturated sodium iodide solution, and then they were sifted in the mouth of the open chlorine water bottle; the sodium bromide filter paper showed brown red of bromine, and The odor of bromine can be smelled; the paper strips on which sodium iodide is dropped show a brown-black iodine color and have a metallic luster. Replace the filter paper with bromine replaced with another filter paper with sodium iodide solution, and immediately replace it.