Difference between revisions of "Karl Fischer titration"
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| − | Karl-Fischer titration, often shortened to KF titration, is an [[iodometry|iodometric]] [[titration]] technique for the determination of [[water]] content in a sample. | + | Karl-Fischer titration, often shortened to KF titration, is an [[iodometry|iodometric]] [[titration]] technique for the determination of [[water]] content in a sample. The reagents contain, as a minimum, elemental [[iodine], [[sulfur dioxide]], and a suitable base. |
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| + | The overall reaction which occurs is: | ||
| + | : SO<sub>2</sub> + I<sub>2</sub> + 2H<sub>2</sub>O ⇌ H<sub>2</sub>SO<sub>4</sub> + 2HI | ||
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| + | A base must be present in order to drive the equilibrium to the right by reacting with the [[sulfuric acid]] and [[hydriodic acid]] produced. Fischer's original reagent used [[pyridine]], however modern KF reagents tend to use other bases like [[imidazole]] or pyridine derivatives, due to the volatility, toxicity, and unpleasant odour of pyridine. | ||
Revision as of 22:44, 30 November 2018
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Karl-Fischer titration, often shortened to KF titration, is an iodometric titration technique for the determination of water content in a sample. The reagents contain, as a minimum, elemental [[iodine], sulfur dioxide, and a suitable base.
The overall reaction which occurs is:
- SO2 + I2 + 2H2O ⇌ H2SO4 + 2HI
A base must be present in order to drive the equilibrium to the right by reacting with the sulfuric acid and hydriodic acid produced. Fischer's original reagent used pyridine, however modern KF reagents tend to use other bases like imidazole or pyridine derivatives, due to the volatility, toxicity, and unpleasant odour of pyridine.
