Potassium sulfite
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| IUPAC name
Potassium sulfite
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| Other names
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3D model (JSmol)
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| Properties | |
| K2SO3 | |
| Molar mass | 158.26 g/mol |
| Appearance | White solid |
| Density | 2.49 g/cm3[1] |
| 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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Template:Chembox Footer/trackingTemplate:Short description
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]
History
Potassium sulfite was first obtained by Georg Ernst Stahl in the early 18th century,[3] and was therefore known afterwards as Stahl's sulphureous salt. It became the first discovered sulfite and was first properly studied along with other sulfites by French chemists in the 1790s, and it was called sulphite of potash in the early 19th century.[4] Gilles-François Boulduc also discovered the salt in water of Passy in the 1720s.[5]
Production and reactions
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- Page Module:Chem2/styles.css has no content.K2S2O5 → K2SO3 + SO2
Structure
The structure of solid Page Module:Chem2/styles.css has no content.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
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- ^ a b Page Module:Citation/CS1/styles.css has no content.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.
- ^ Page Module:Citation/CS1/styles.css has no content."Potassium sulfite (225)". Codex Alimentarius. Food and Agriculture Organization of the United Nations.
- ^ Page Module:Citation/CS1/styles.css has no content.Coleby, L. J. M. (1938). Studies in the chemical works of Stahl (Doctoral thesis). University of London. pp. 57–63, 181.
- ^ Page Module:Citation/CS1/styles.css has no content.Thomson, Thomas (1807). System of Chemistry.
- ^ Page Module:Citation/CS1/styles.css has no content.Chang, Ku-ming (Kevin) (2014). "Communications of Chemical Knowledge: Georg Ernst Stahl and the Chemists at the French Academy of Sciences in the First Half of the Eighteenth Century". Osiris. 29 (1): 135–157. doi:10.1086/678101. ISSN 0369-7827. JSTOR 10.1086/678101.
- ^ Page Module:Citation/CS1/styles.css has no content.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.
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