酚酞指示剂在酸碱溶液中变色复杂性探讨

Complexity of Phenolphthalein(PP) Changing Colors in Acidic Solution and Basic Solution

文章通过酚酞指示剂与不同浓度、不同类型的酸碱反应事实和理论探讨得出:酚酞作为一种常用指示剂,不适宜直接检验强酸或强碱;酚酞指示剂与强氧化剂会产生氧化反应,失去指示剂功能;酚酞溶解性极低,在酸碱滴定过程中用量必须有限制。

We research the reaction between PP and different acids and different bases.From the results,we can draw a conclusion that it is unfit to test strong acids or strong bases with PP,because PP can react with oxidations.