Potassium sulfite
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Names | |
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IUPAC name
Potassium sulfite
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Other names
E225
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
PubChem CID
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UNII | |
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Properties | |
K2SO3 | |
Molar mass | 158.26 g/mol |
Appearance | White solid |
Soluble | |
Acidity (pKa) | 8 |
−64.0·10−6 cm3/mol | |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Other anions
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Potassium sulfate Potassium selenite |
Other cations
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Sodium sulfite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium sulfite is the inorganic compound with the formula K2SO3. It is the salt of potassium cation and sulfite anion. It is a white solid that is highly soluble in water.
Use
Potassium sulfite is widely used for preserving food and beverages.
Production and reactions
Potassium sulfite is produced by the thermal decomposition of potassium metabisulfite at 190°C:[1]
- K2S2O5 → K2SO3 + SO2
References
- ^ Johnstone, H. F. (1946). "Sulfites and Pyrosulfites of the Alkali Metals". Inorganic Syntheses. 2: 162–167. doi:10.1002/9780470132333.ch49. ISBN 9780470132333.
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