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常见的酸碱指示剂有哪两种
更新时间: 2020-10-31 00:00:00  

常见的酸碱指示剂是酚酞和石蕊,其中酚酞是一种化学成品,它呈现晶体粉末状,而且几乎不溶于水,其特性是在酸性和中性溶液中为无色,而在碱性溶液中为紫红色。而石蕊(Litmus)的性状为蓝紫色粉末,它是从地衣植物中提取得到的蓝色色素,其变色的pH范围是4.5-8.3,而且它是一种弱的有机酸,在酸碱溶液的不同作用下可以发生共轭结构的改变而变色。

关键词: 常见 酸碱 指示剂

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