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檢驗酸性溶液的石蕊試紙是藍色的,酸性溶液可使之變為紅色. 同理,檢驗鹼性溶液的石蕊試紙是紅色,鹼性溶液可使之變為藍色.
在酸性條件下硝酸根離子有强氧化性,可以將亞鐵離子氧化為鐵離子,囙此三者不能共存
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