Magnesium sulfite

Magnesium sulfite is the magnesium salt of sulfurous acid with the formula MgSO
3. Its most common hydrated form has 6 water molecules making it a hexahydrate, MgSO
3·6H
2O. When heated above 40 °C (104 °F), it is dehydrated to magnesium sulfite trihydrate, or MgSO
3·3H
2O.[1] The anhydrous form is hygroscopic, meaning that it readily absorbs water from the air.

Magnesium sulfite
Names
IUPAC name
Magnesium sulfite
Other names
Magnesium sulphite
Identifiers
ChemSpider
ECHA InfoCard 100.028.932
EC Number
  • 231-825-6
UNII
Properties
MgSO
3 (anhydrous); MgSO
3·6H
2O
Molar mass 104.368200 g/mol (anhydrous)
212.4599 g/mol (hexahydrate)
5.2g/L at 298.2K (hexahydrate)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

See also

References
  1. Nývlt, J., "Solubilities of Magnesium Sulfite," Journal of Thermal Analysis and Calorimetry, Volume 66, Number 2 / November, 2001

solubility tables of MgSO3 hydrates PDF[1]

  1. , H.D.Lutz, Dept. of Chemistry, University of Slegen.
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