| M Formula: | MgSO3•6H2O |
| Properties: | |
| White, crystalline powder. D 1.725, mp loses 6H2O at 200C, bp (decomposes). Slightly soluble in water; insoluble in alcohol. | |
| Derivation: | |
| Action of sulfurous acid on magnesium hydroxide. | |
| Use: | |
| Manufacture of paper pulp (as bisulfite). | |