| Identification | Back Directory | [Name]
MAGNESIUM SULFITE | [CAS]
7757-88-2 | [Synonyms]
Einecs 231-825-6
MAGNESIUM SULFITE
magnesium sulphite
Sulfurous acid magnesium salt
sulfurousacid,magnesiumsalt(1:1) | [EINECS(EC#)]
231-825-6 | [Molecular Formula]
MgO3S | [MDL Number]
MFCD00040664 | [MOL File]
7757-88-2.mol | [Molecular Weight]
104.37 |
| Chemical Properties | Back Directory | [Appearance]
White, crystalline powder. Slightly
soluble in water; insoluble in alcohol. | [density ]
1.725 g/cm3 | [Water Solubility ]
g/100g solution H2O: 0.338 (0°C), 0.646 (25°C), 0.615 (98°C); solid phase, MgSO3 · 6H2O (0°C, 25°C), MgSO3 ·3H2O (98°C) [KRU93] | [Solubility Product Constant (Ksp)]
pKsp: 2.50 | [InChI]
InChI=1S/Mg.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+2;/p-2 | [InChIKey]
JESHZQPNPCJVNG-UHFFFAOYSA-L | [SMILES]
S([O-])([O-])=O.[Mg+2] | [Uses]
Manufacture of paper pulp (as bisulfite). | [EPA Substance Registry System]
Sulfurous acid, magnesium salt (1:1) (7757-88-2) |
| Hazard Information | Back Directory | [Chemical Properties]
White, crystalline powder. Slightly
soluble in water; insoluble in alcohol. | [Preparation]
Magnesium Sulfite can be prepared
by the reaction of a magnesium hydroxide slurry and
SO2 gas:
Mg(OH)2＋ SO2(gas) ＋H2O→MgSO3·6H2O
If the solution temperature is kept below 40°C, the
hexahydrate results. Above 40°C, the trihydrate,
MgSO3·3H2O, is the usual product. Magnesium sulfite
may also be prepared by adding a solution of sodium
sulfite to a solution of magnesium chloride. The mix is
kept at 25°C for 1–2 h and the solid phase which forms
is separated and washed with isopropanol and dried at
60°C. Again, the hexahydrate results. |
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