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Magnesium sulfite information


Magnesium sulfite
Names
IUPAC name
Magnesium sulfite
Other names
Magnesium sulphite
Identifiers
CAS Number
  • 7757-88-2 checkY
ChemSpider
  • 2282946
ECHA InfoCard 100.028.932 Edit this at Wikidata
EC Number
  • 231-825-6
PubChem CID
  • 3014583
UNII
  • 792J6K230W checkY
CompTox Dashboard (EPA)
  • DTXSID50884418 Edit this at Wikidata
Properties
Chemical formula
MgSO
3
(anhydrous); MgSO
3
·6H
2
O
Molar mass 104.368200 g/mol (anhydrous)
212.4599 g/mol (hexahydrate)
Solubility in water
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

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
2
O
. When heated above 40 °C (104 °F), it is dehydrated to magnesium sulfite trihydrate, or MgSO
3
·3H
2
O
.[1] The anhydrous form is hygroscopic, meaning that it readily absorbs water from the air.

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

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