Magnesium sulfite is the magnesium salt of sulfurous acid with the formula . Its most common hydrated form has 6 water molecules making it a hexahydrate, ·6. When heated above , it is dehydrated to magnesium sulfite trihydrate, or ·3.Nývlt, J., "Solubilities of Magnesium Sulfite," Journal of Thermal Analysis and Calorimetry, Volume 66, Number 2 / November, 2001 The anhydrous form is hygroscopic, meaning that it readily absorbs water from the air.
See also Calcium sulfite Magnesium sulfate (Epsom salt)
External links Solubility tables of MgSO3
References