檢視金属指示剂的原始碼

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中文名；金属指示剂

外文名；metal indicator

别称；金属离子指示剂

学科；分析化学

应用；络合滴定法

实例；铬黑T、NN指示剂等
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'''金属指示剂'''又称金属离子指示剂，是络合滴定法中使用的[[指示剂]]。指示终点的原理是在一定pH值下，指示剂与金属离子络合，生成与指示剂游离态颜色不同的络离子。等当点时，滴定剂置换出指示剂，当观察到从络离子的颜色转变为指示剂游离态的颜色时即达终点。如在pH值=10时，用乙二胺四乙酸二钠测定水的[[硬度]]，选铬黑T作指示剂。当溶液由红色变为蓝色时即达终点。<ref>[https://wenku.so.com/d/dc2143ed866d9511ec0d25948e1cb191 常用金属指示剂 ],360搜索 , 2017-06-08</ref>