Oxidation-reduction titration
Oxidation-reduction titration is a method used to quantify a compound by measuring the amount of an oxidizing or reducing agent required to completely oxidize or reduce the compound using a normal or standard solution of the oxidizing or reducing agent.
As oxidizing agents, potassium permanganate (KMnO4) and iodine (I2) are commonly used whereas sodium thiosulfate (Na2S2O3) and sodium oxalate (Na2C2O4) are often used as reducing agents.
Potassium permanganate (KMnO4) is reduced by oxidation-reduction titration and its color changes from purple to colorless. When the end point is reached, a very small amount of excess MnO4 changes the color to rose-pink, allowing for determination of the end point.
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Examples of oxidation-reduction indicator
| Indicator | Color in reduced state | Color in oxidized state | E゜(V) |
|---|---|---|---|
| Phenosafranine | Colorless | Red | 0.25-0.26 |
| Methylene Blue | Colorless | Blue | 0.532 |
| Variamine Blue b | Colorless | Reddish purple | 0.68 |
| Diphenylamine | Colorless | Purple | 0.776 |
| Diphenylbenzidine | Colorless | Purple | 0.776 |
| Diphenylaminesulfonate Barium | Colorless | Reddish purple | 0.84 |
| Dimethylferroin | Red | Yellow green | 0.97 |
| Ferroin | Red | Pale blue | 1.06 |
| Methylferroin | Red | Pale blue | 1.08 |
For research use or further manufacturing use only. Not for use in diagnostic procedures.
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