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石蕊遇酸變紅,遇堿變藍,酚酞遇酸不變色,遇堿變藍
石蕊試液和酚酞試液都是酸堿指示劑,可以用來檢驗溶液是酸性的,還是鹼性的溶液. 石蕊試液原本是紫色,遇到酸性溶液都變成紅色,遇到鹼性溶液都變成藍色,遇到中性溶液不變色,仍然是原來的紫色. 酚酞試液遇到鹼性溶液都變紅色,遇到酸性或中性溶液不變色,仍然是無色. 不懂問
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