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In [[analytical chemistry]], complexometric [[indicator]]s are used in [[complexometric titration]] to indicate the exact moment when all the metal ions in the solution are sequestered by a [[chelating agent]] (most usually [[EDTA]]). Such indicators are also called '''metallochromic indicators'''.
The indicator may be present in another liquid
Some complexometric indicators are sensitive to air and are destroyed. When such solution loses color during titration, a drop or two of fresh indicator may have to be added.
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