Sodium sulfite heptahydrate, CAS 10102-15-5

Colorless crystals

• Product ID: SO31313

• Formula: Na2SO3·7H2O

• MW: 252.15g/mol

• CAS:  10102-15-5

• Purity: 98%+

• MP: water loss around 150℃, decomposes after 500℃

• Solubility: 220-240 g/L in water

• Synonyms: Disodium sulfite, heptahydrate; sulfurous acid, sodium salt, heptahydrate 

Sodium sulfite heptahydrate is a soluble, hydrated sodium salt of sulfurous acid (sulfite) with the chemical formula Na2SO3·7H2O. It is also used as a preservative to prevent discoloration of objects. Sodium sulfite exhibits bleaching, desulfurizing, and dechlorinating properties. It is also useful as an oxygen scavenger in photography, tanning, paper & pulp, steam boilers where it plays a key role in remediating corrosion corrosion problems. In synthetic chemistry, sodium sulfite heptahydrate is used as a sulfonation agent, as well as in the production of sodium thiosulfate.