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
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 (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). N verify (what is YN ?) 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

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

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