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指示剂的封闭对滴定终点有何影响

更新时间: 2020-10-29 00:00:00     

指示剂出现封闭现象,会看不到滴定终点应用的颜色突变。出现这种现象时,解决的办法是加入掩蔽剂。有些指示剂或金属指示剂配合物在水中的溶解度太小,使得滴定剂与金属-指示剂配合物交换缓慢,终点拖长,称为指示剂僵化。指示剂的氧化变质现象,金属指示剂大多为含双键的有色化合物,易被日光、空气所分解,在水溶液中多不稳定,日久会变质。

关键词: 指示剂 封闭 终点 影响

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