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溴單質可以置換碘離子,生成碘單質使淀粉碘化鉀試紙變藍,反應為:
Br2+2I-=I2+2Br-
次溴酸可以氧化碘離子,反應為:
BrO-+2I-+H2O=Br-+I2+2OH
次氯酸鈉是氧化碘離子生成碘單質,反應為:
ClO-+2I-+H2O=Cl-+I2+2OH-
氯氣要和濕潤的淀粉KI試紙接觸才能發生變色反應。
能使淀粉KI試紙變色的物質

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