Chemistry:Potassium sulfite

Potassium sulfite

Names
IUPAC name Potassium sulfite
Other names E225
Identifiers
CAS Number	10117-38-1 Y
3D model (JSmol)	Interactive image
ChemSpider	23332 N
PubChem CID	24958
UNII	015KZC652E N
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
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).
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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. 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:

K₂S₂O₅ → K₂SO₃ + SO₂

Structure

The structure of solid K
2SO
3, as assessed by X-ray crystallography. The S-O distances are 1.515 Å, and the O-S-O angles are 105.2°