Title: Magnesium Sulfite

CAS Registry Number: 7757-88-2

Molecular Formula: MgO3S

Molecular Weight: 104.37

Percent Composition: Mg 23.29%, O 45.99%, S 30.72%

Line Formula: MgSO3

Literature References: Occurs as tri- and hexahydrates.

 

Derivative Type: Hexahydrate

Properties: Colorless crystals or white, cryst powder; gradually oxidizes to sulfate on exposure to air; loses all its water at 200°; dec at higher temp. Sol in ~150 parts water, slightly more in boiling water.

 

Use: A soln of magnesium sulfite in sulfurous acid (magnesium bisulfite) is used in the manuf of paper pulp.