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演示二氧化硫的漂白作用,一定要让学生既能看到颜色的消失,又能看到颜色的恢复,以示区别于氯气的漂白作用(经氯气漂白的物品不能再恢复原色)。二氧化硫漂白作用,最理想的试剂是品红溶
To demonstrate the bleaching effect of sulfur dioxide, students must be able to see both the disappearance of color and the recovery of color to show the bleaching effect that is different from that of chlorine (the chlorine-bleached items can no longer be restored to their original colors). Sulfur dioxide bleaching, the most ideal reagent is the Magenta