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如何鉴别酸碱溶液
更新时间： 2020-09-16 00:00:00  

1、与指示剂作用。紫色石蕊试液遇酸溶液变成红色，遇碱溶液变成蓝色；无色酚酞遇酸溶液不变色，遇碱溶液变红色；

2、定义法。酸溶液电离出来的阳离子，只有氢离子；碱溶液电离出来的阴离子，只有氢氧根离子；

3、使用PH试纸。PH值小于7时，显酸性，PH值越小，酸性越强；PH值大于7时，显碱性，PH值越大，碱性越强。

关键词： 如何 鉴别 酸碱 溶液

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