Editing Redox titration

{{Short description|Type of titration based on redox reactions}}
{{More citations needed|date=February 2022}}
A '''redox titration <ref>{{Cite book|last=Burgot|first=Jean-Louis|title=Ionic Equilibria in Analytical Chemistry|publisher=[[Springer Publishing|Springer]]|year=2012|isbn=978-1-4419-8381-7|location=New York|pages=25–26}}</ref>''' is a type of [[titration]] based on a [[redox reaction]] between the [[analyte]] and titrant. It may involve the use of a [[redox indicator]] and/or a potentiometer. A common example of a redox titration is the treatment of a solution of [[iodine]] with a reducing agent to produce [[iodide]] using a [[starch indicator]] to help detect the endpoint. [[Iodine]] (I<sub>2</sub>) can be reduced to [[iodide]] (I<sup>&minus;</sup>) by, say,  [[thiosulfate]] ({{chem2|S2O3(2-)}}), and when all the iodine is consumed, the blue colour disappears. This is called an [[iodometry|iodometric]] titration.

Most often, the reduction of iodine to iodide is the last step in a series of reactions where the initial reactions convert an unknown amount of the [[solute]] (the substance being analyzed) to an equivalent amount of iodine, which may then be titrated. Sometimes other [[halogen]]s (or haloalkanes) besides iodine are used in the intermediate reactions because they are available in better measurable [[standard solution]]s and/or react more readily with the solute. The extra steps in iodometric titration may be worthwhile because the [[equivalence point]], where the blue turns a bit colourless, is more distinct than in some other analytical or volumetric methods. 

The main redox titration types are:

:{| class="wikitable"
|-
! Redox titration !! Titrant
|-
| [[Iodometry]] || [[Iodine]] (I<sub>2</sub>)
|-
| [[Bromatometry]] || [[Bromine]] (Br<sub>2</sub>)
|-
| [[Cerimetry]] || [[Cerium]](IV) salts
|-
| [[Permanganometry]] || [[Potassium permanganate]]
|-
| [[Dichrometry]] || [[Potassium dichromate]]
|-
|}

== Sources ==
<references />
:

==See also==
*[[Oxidizing agent]]
*[[Reducing agent]]

{{DEFAULTSORT:Redox Titration}}
[[Category:Titration]]