Potassium sulfite
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Names | |
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IUPAC name Potassium sulfite | |
Other names
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Identifiers | |
CAS Number |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.279 ![]() |
PubChem CID |
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CompTox Dashboard (EPA) |
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InChI
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Properties | |
Chemical formula | K2SO3 |
Molar mass | 158.26 g/mol |
Appearance | White solid |
Density | 2.49 g/cm3[1] |
Solubility in water | Soluble |
Acidity (pKa) | 8 |
Magnetic susceptibility (χ) | −64.0·10−6 cm3/mol |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Other anions | Potassium sulfate Potassium selenite |
Other cations | Sodium sulfite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). ![]() ![]() ![]() Infobox references |
Chemical compound
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. Potassium sulfite is used for preserving food and beverages.[2]
Production and reactions
Potassium sulfite is produced by the thermal decomposition of potassium metabisulfite at 190 °C:[3]
- K2S2O5 → K2SO3 + SO2
Structure
The structure of solid K2SO3, as assessed by X-ray crystallography. The S-O distances are 1.515 Å, and the O-S-O angles are 105.2°[1]
References
- ^ a b Andersen, Leif; Strömberg, Dan; Nevala, H.; Pohjola, S.; Niinistö, Lauri; Volden, Hans V.; Weidlein, Johann; Zingaro, Ralph A. (1986). "The Structure of Potassium Sulfite". Acta Chemica Scandinavica. 40a: 479–480. doi:10.3891/acta.chem.scand.40a-0479.
- ^ "Potassium sulfite (225)". Codex Alimentarius. Food and Agriculture Organization of the United Nations.
- ^ Johnstone, H. F. (1946). "Sulfites and Pyrosulfites of the Alkali Metals". Inorganic Syntheses. Vol. 2. pp. 162–167. doi:10.1002/9780470132333.ch49. ISBN 9780470132333.
- v
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- K3N
- KNH2
- KN3
- KNO2
- KNO3
- K3P
- KH2PO3
- K3PO4
- K2HPO4
- KH2PO4
- KPF6
- KAsO2
- K3AsO4
- K2HAsO4
- KH2AsO4
- B4K2O7
- K2CO3
- KHCO3
- K2SiO3
- K2SiF6
- K2Al2O4
- K2Al2B2O7
- K2PtCl4
- K2Pt(CN)4
- K2TiF6
- K2PtCl6
- K2ReCl6
- KAsF6
- K2ZrF6
- K4Fe(CN)6
- K3Fe(CN)6
- K3Fe(C2O4)3
- K2FeO4
- K2MnO4
- KMnO4
- K3CrO4
- K2CrO4
- K3CrO8
- KCrO3Cl
- K2Cr2O7
- K2Cr3O10
- K2Cr4O13
- K4Mo2Cl8
- KHCO2
- KCH3CO2
- KCF3CO2
- K2C2O4
- KHC2O4
- KC12H23O2
- KC18H35O2
- C3H2K2O4
- C4H6KO4
- C5H7KO4