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怎样鉴别酸用三种物质
更新时间: 2020-07-06 00:00:00  

1、酚酞指示剂:在待测液中滴加酚酞指示剂,如果是酸则待测液颜色不变,如果是碱则待测液颜色变成红色。

2、紫色石蕊试液:在待测液中滴加紫色石蕊试液或者试纸,如果待测液是是酸则试液变成红色,如若是碱则变成蓝色。

3、PH试纸:选用PH试纸也可以测试溶液酸碱性。用玻璃棒蘸取适量待测液,轻触试纸一端,比对试纸变色表,PH值小于7则表示偏酸性,大于7则偏碱性。

关键词: 怎样 鉴别 物质

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