题目内容

测定商品双氧水中的H2O2含量时，在（）（填一种酸）的酸性条件下，可用KMnO4标准溶液直接滴定。滴定之初反应较慢，可以在滴定前加几滴（）溶液作指示剂。工业双氧水中有时会含有一些有机物，使得测定结果（）（填“偏高”、“偏低”或“无影响”）。

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