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甲基橙的變色範圍是pH值為3.1-4.4;酚酞的變色範圍是pH值為8-10;石蕊的變色範圍是pH值為5-8.
石蕊試劑和酚酞都屬於ph試劑.石蕊試劑本身是紫色加酸變紅加堿變藍.如加氧化性酸或强金屬過氧化物先變色後褪色.酚酞本身是無色加堿變紅,加酸不變色,只能測鹼性物質.但加某些强金屬過氧化物先變色後氧化褪色.
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