Potassium sulfite

Potassium sulfite
Names
	IUPAC name Potassium sulfite
	Other names E225;
Identifiers
CAS Number	10117-38-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	23332 ;
ECHA InfoCard	100.030.279
PubChem CID	24958;
UNII	015KZC652E ;
CompTox Dashboard (EPA)	DTXSID80889532 ;
	InChI InChI=1S/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2 Key: BHZRJJOHZFYXTO-UHFFFAOYSA-L ; InChI=1/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2 Key: BHZRJJOHZFYXTO-NUQVWONBAU;
	SMILES [O-]S(=O)[O-].[K+].[K+];
Properties
Chemical formula	K2SO3
Molar mass	158.26 g/mol
Appearance	White solid
Density	2.49 g/cm3
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). verify (what is ?) Infobox references

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

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]

^ ^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.

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v t e Potassium compounds
H, (pseudo)halogens	KF KHF₂ KH KCl KClO KClO₃ KClO₄ KBr KBrO₃ KI KIO₃ KIO₄ KAt KCN KCNO KOCN KSCN
chalcogens	K₂O KOH K₂O₂ KO₂ KO₃ K₂S KHS K₂SO₃ KHSO₃ K₂SO₄ KHSO₄ KHSO₅ K₂S₂O₃ K₂S₂O₅ K₂S₂O₇ K₂S₂O₈ K₂Se K₂SeO₃ K₂SeO₄ K₂Te K₂TeO₃ K₂TeO₄ K₂Po
pnictogens	K₃N KNH₂ KN₃ KNO₂ KNO₃ K₃P KH₂PO₃ K₃PO₄ K₂HPO₄ KH₂PO₄ KPF₆ KAsO₂ K₃AsO₄ K₂HAsO₄ KH₂AsO₄
B, C group	B₄K₂O₇ K₂CO₃ KHCO₃ K₂SiO₃ K₂SiF₆ K₂Al₂O₄ K₂Al₂B₂O₇
trans metals	K₂PtCl₄ K₂Pt(CN)₄ K₂TiF₆ K₂PtCl₆ K₂ReCl₆ K₂ZrF₆ K₄Fe(CN)₆ K₃Fe(CN)₆ K₃Fe(C₂O₄)₃ K₂FeO₄ K₂MnO₄ KMnO₄ K₃CrO₄ K₂CrO₄ K₃CrO₈ KCrO₃Cl K₂Cr₂O₇ K₂Cr₃O₁₀ K₂Cr₄O₁₃ K₄Mo₂Cl₈
organic	KHCO₂ KCH₃CO₂ KCF₃CO₂ K₂C₂O₄ KHC₂O₄ KC₁₂H₂₃O₂ KC₁₈H₃₅O₂ C₃H₂K₂O₄ C₄H₆KO₄ C₅H₇KO₄

Names

IUPAC name Potassium sulfite
Other names E225
Identifiers
CAS Number	10117-38-1^Y
3D model (JSmol)	Interactive image
ChemSpider	23332^N
ECHA InfoCard	100.030.279
PubChem CID	24958
UNII	015KZC652E^N
CompTox Dashboard (EPA)	DTXSID80889532
InChI InChI=1S/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2^N Key: BHZRJJOHZFYXTO-UHFFFAOYSA-L^N InChI=1/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2 Key: BHZRJJOHZFYXTO-NUQVWONBAU
SMILES [O-]S(=O)[O-].[K+].[K+]
Properties
Chemical formula	K₂SO₃
Molar mass	158.26 g/mol
Appearance	White solid
Density	2.49 g/cm³^[1]
Solubility in water	Soluble
Acidity (pK_a)	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). N verify (what is ^YN ?) Infobox references