Complexometric indicator: Difference between revisions

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{{short description|Chemical detector for metal ions in complexometric titrations}}

A '''complexometric indicator''' is an [[ionochromism|ionochromic]] [[dye]] that undergoes a definite color change in presence of specific metal [[ion]]s.<ref name="isbn0-416-19290-4">{{cite book |author1=Flaschka, H. |author2=Schwarzenbach, G. |author3=Schwarzenbach, Gerold |title=Complexometric titrations |publisher=Methuen |___location=London |year=1969 |pages= |isbn=0-416-19290-4 |oclc= |doi= |accessdate=}}</ref> It forms a weak [[complex (chemistry)|complex]] with the ions present in the solution, which has a significantly different color from the form existing outside the complex.

Complexometric indicators are also known as pM indicators.<ref name="isbn1-898563-47-0">{{cite book |author=M. A. Malati |title=Experimental Inorganic/Physical Chemistry: An Investigative, Integrated Approach to Practical Project Work (Horwood Series in Chemical Science) |publisher=Albion/Horwood Pub |___location= |year=1999 |page=20 |isbn=1-898563-47-0 |oclc= |doi= |accessdate=}}</ref>

==Complexometric titration==

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* [[Calcein]] with [[Ethylenediaminetetraacetic acid|EDTA]] for calcium

* [[Patton-Reeder Indicator]] with [[Ethylenediaminetetraacetic acid|EDTA]] for calcium with magnesium

* [[Curcumin]] for [[boron]], that forms [[Rosocyanine]], although the red color change of curcumin also occurs for pH > 8.4

* [[Eriochrome Black T]] for [[aluminium]], [[cadmium]], [[zinc]], [[calcium]] and [[magnesium]]

* [[Fast Sulphon Black]] with [[Ethylenediaminetetraacetic acid|EDTA]] for [[copper]]

* [[Hematoxylin]] for [[copper]]

* [[Murexide]] for calcium and [[rare earths]], but also for [[copper]], [[nickel]], [[cobalt]], and [[thorium]]

* [[Xylenol orange]] for [[gallium]], [[indium]] and [[scandium]]

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==References==

{{reflistReflist}}

==External links==

*{{Commonscatinline|Complexometric indicators}}

[[Category:Analytical chemistry]]

[[Category:Complexometric indicators| ]]

{{analytical-chemistry-stub}}