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| verifiedrevid = 265541518 |
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| ImageFile = Potassium sulfite.png |
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| verifiedrevid = 384773163 |
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| ImageSize = 120px |
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| ImageFile = K2SO3.svg |
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| ImageSize = 150px |
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| IUPACName = Potassium sulfite |
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| IUPACName = Potassium sulfite |
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| OtherNames = E225 |
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| OtherNames = {{Unbulleted list|E225}} |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo = 10117-38-1 |
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| CASNo = 10117-38-1 |
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| CASNo_Ref = {{cascite}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| UNII_Ref = {{fdacite|changed|FDA}} |
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| PubChem = 24958 |
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| UNII = 015KZC652E |
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| PubChem = 24958 |
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| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}} |
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| ChemSpiderID = 23332 |
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| InChI = 1/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 |
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| InChIKey = BHZRJJOHZFYXTO-NUQVWONBAU |
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| StdInChI_Ref = {{stdinchicite|changed|chemspider}} |
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| StdInChI = 1S/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 |
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| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}} |
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| StdInChIKey = BHZRJJOHZFYXTO-UHFFFAOYSA-L |
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| SMILES = S(=O).. |
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| Section2= {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = K<sub>2</sub>S</sub>O<sub>3 |
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| Formula = K<sub>2</sub>SO<sub>3</sub> |
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| MolarMass = 158.26 g/mol |
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| MolarMass = 158.26{{nbsp}}g/mol |
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| Appearance = white solid |
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| Appearance = White solid |
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| Density = 2.49 g/cm<sup>3</sup><ref name=Chalmers/> |
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| Solubility = soluble |
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| Solubility = Soluble |
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| pKa = 8 |
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| MagSus = −64.0·10<sup>−6</sup>{{nbsp}}cm<sup>3</sup>/mol |
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| ExternalMSDS = |
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| EUIndex = Not listed |
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| FlashPt = Non-flammable |
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| FlashPt = Non-flammable |
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| OtherAnions = ]<br/>] |
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| OtherCations = ] |
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'''Potassium sulfite''' (K<sub>2</sub>SO<sub>3</sub>) is a chemical compound which is the ] of ] cation and ] anion. As a ] it is used as a ] under the ] E225. |
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'''Potassium sulfite''' is the ] with the formula K<sub>2</sub>SO<sub>3</sub>. It is the ] of ] cation and ] anion. It is a white solid that is highly soluble in water. Potassium sulfite is used for ].<ref>{{Cite web | url = https://www.fao.org/gsfaonline/additives/details.html?id=229 | title = Potassium sulfite (225) | work = Codex Alimentarius | publisher = Food and Agriculture Organization of the United Nations }}</ref> |
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== History == |
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Potassium sulfite was first obtained by ] in the early 18th century,<ref>{{Cite thesis |last=Coleby |first=L. J. M. |title=Studies in the chemical works of Stahl |date=1938 |degree=Doctoral |publisher=University of London |url=https://discovery.ucl.ac.uk/id/eprint/19500/ |pages=57-63, 181}}</ref> 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.<ref>{{Cite book |last=Thomson |first=Thomas |url=https://books.google.com/books?id=m6P1HsMsAuYC&pg=PA2 |title=System of Chemistry |date=1807 |language=en}}</ref> ] also discovered the salt in water of ] in the 1720s.<ref>{{Cite journal |last=Chang |first=Ku-ming (Kevin) |date=2014 |title=Communications of Chemical Knowledge: Georg Ernst Stahl and the Chemists at the French Academy of Sciences in the First Half of the Eighteenth Century |url=https://www.jstor.org/stable/10.1086/678101 |journal=Osiris |volume=29 |issue=1 |pages=135–157 |doi=10.1086/678101 |issn=0369-7827}}</ref> |
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== Production and reactions == |
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{{main|Sulfite#Reactions}} |
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{{see also|Wellman–Lord process}} |
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Potassium sulfite is produced by the thermal decomposition of ] at 190 °C:<ref>{{cite book|doi=10.1002/9780470132333.ch49|isbn=9780470132333|chapter=Sulfites and Pyrosulfites of the Alkali Metals|year=1946|last1=Johnstone|first1=H. F.|title=Inorganic Syntheses |pages=162–167|volume=2}}</ref> |
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:{{chem2 | K2S2O5 -> K2SO3 + SO2 }} |
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==Structure== |
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The structure of solid {{chem2|K2SO3}}, as assessed by ]. The S-O distances are 1.515 Å, and the O-S-O angles are 105.2°<ref name=Chalmers>{{cite journal |doi=10.3891/acta.chem.scand.40a-0479 |title=The Structure of Potassium Sulfite |date=1986 |last1=Andersen |first1=Leif |last2=Strömberg |first2=Dan |last3=Nevala |first3=H. |last4=Pohjola |first4=S. |last5=Niinistö |first5=Lauri |last6=Volden |first6=Hans V. |last7=Weidlein |first7=Johann |last8=Zingaro |first8=Ralph A. |journal=Acta Chemica Scandinavica |volume=40a |pages=479–480 |doi-access=free }}</ref> |
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== References == |
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{{reflist}} |
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{{Potassium compounds}} |
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{{Potassium compounds}} |
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{{Sulfites}} |
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