Potassium sulfite

Potassium sulfite
Potassium sulfite
Are common
Systematic ; name	Potassium sulfite
Chem. formula	K 2 SO 3
Physical properties
Molar mass	158.26 g / mol
Density	~ 2.5 g / cm³
Classification
Reg. CAS number	10117-38-1
PubChem
Reg. EINECS number
Smiles
Inchi
Codex Alimentarius
ChemSpider

Potassium sulfite (K ₂ SO ₃ , Potassium Sulphite, Dipotassium sulfite, E225 ) is a white crystalline substance of monoclinic syngony, decomposes on heating, is readily soluble in water, and has reducing properties.

The molar mass is 158.26 g / mol. The molar conductivity at infinite dilution at 25 ° C is 291 cm · cm² / mol.

Getting

It can be obtained by the interaction of potassium carbonate with sulfur dioxide :

{\mathsf {K_{2}CO_{3}+SO_{2}\rightarrow K_{2}SO_{3}+CO_{2}}}

{\ displaystyle {\ mathsf {K_ {2} CO_ {3} + SO_ {2} \ rightarrow K_ {2} SO_ {3} + CO_ {2}}}}

Chemical Properties

Like all sulfites, it exhibits reducing properties. For example, in an acidic environment it is easily oxidized by potassium permanganate :

{\mathsf {2KMnO_{4}+5K_{2}SO_{3}+3H_{2}SO_{4}\rightarrow 6K_{2}SO_{4}+2MnSO_{4}+3H_{2}O}}

{\ displaystyle {\ mathsf {2KMnO_ {4} + 5K_ {2} SO_ {3} + 3H_ {2} SO_ {4} \ rightarrow 6K_ {2} SO_ {4} + 2MnSO_ {4} + 3H_ {2} O }}}

In humid air or in contact with water, a crystalline hydrate is formed containing 2 water molecules - K ₂ SO ₃ · 2H ₂ O (CAS number 7790-56-9).

Application

Used as a preservative as a food supplement E225.

Potassium sulfite

Are common
Systematic name	Potassium sulfite
Chem. formula	K ₂ SO ₃
Physical properties
Molar mass	158.26 g / mol
Density	~ 2.5 g / cm³
Classification
Reg. CAS number	10117-38-1
PubChem
Reg. EINECS number
Smiles
Inchi
Codex Alimentarius
ChemSpider

Potassium sulfite

Getting

Chemical Properties

Application

More articles: