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Reference.org
Complexometric titration
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<p>Complexometric titration (sometimes chelatometry) is a form of <a href="/facts/Volumetric_analysis/gGUfvQcW">volumetric analysis</a> in which the formation of a colored complex is used to indicate the end point of a titration. Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution. An <a href="/facts/Complexometric_indicator/vIjdmj4P">indicator</a> capable of producing an unambiguous color change is usually used to detect the end-point of the titration. Complexometric titrations are those reactions where a simple ion is transformed into a complex ion and the equivalence point is determined by using metal indicators or electrometrically. </p>