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在容量分析中能显示终点的分析试剂。
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一类能因某化合物的存在或介质特性（如酸碱性、氧化还原电位等）的改变而变换自身颜色等的化学试剂。滴定分析中指示剂能在滴定反应的化学计量点附近产生颜色、沉淀等可察觉变化，从而指示滴定终点。
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①指示器 ②指示剂 ③示功器｛机｝
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＞分析化学＞化学分析＞释义
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