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Magnesium Sulphate
Magnesium Sulphate

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Magnesium Sulphate
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Product: Magnesium Sulphate
High Quality
Earliest Shipment
Competitive price
Professional Service


Magnesium sulfate (or magnesium sulphate) is a chemical compound containing magnesium, sulfur and oxygen, with the formula MgSO4. It is often encountered as the heptahydrate epsomite (MgSO4·7H2O), commonly called Epsom salt, from the town of Epsom in Surrey, England, where the salt was distilled from the springs that arise where the porous chalk of the North Downs meets non-porous London clay. Another hydrate form is kieserite.

Anhydrous magnesium sulfate is used as a drying agent. Since the anhydrous form is hygroscopic (readily absorbs water from the air) and is therefore difficult to weigh accurately, the hydrate is often preferred when preparing solutions, for example in medical preparations. Epsom salt has been traditionally used as a component of bath salts.



Magnesium sulfateIdentifiersPropertiesStructureHazardsRelated compounds

IUPAC name[hide]Magnesium sulfate
Other names[hide]Epsom salt
Bitter salts
CAS number7487-88-9 Y, 14168-73-1 (monohydrate), 24378-31-2 (tetrahydrate), 15553-21-6 (pentahydrate), 13778-97-7 (hexahydrate), 10034-99-8 (heptahydrate)
ChemSpider22515 Y
RTECS numberOM4500000
Jmol-3D imagesImage 1
[show]InChI=1S/Mg.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Y
Key: CSNNHWWHGAXBCP-UHFFFAOYSA-L Y InChI=1/Mg.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
Molecular formulaMgSO4
Molar mass120.366 g/mol (anhydrous)
246.47 g/mol (heptahydrate)
Appearancewhite crystalline solid
Density2.66 g/cm3 (anhydrous)
2.445 g/cm3 (monohydrate)
1.68 g/cm3 (heptahydrate)
1.512 g/cm3 (11-hydrate)
Melting point

1124 °C (anhydrous, decomp)
200 °C (monohydrate, decomp)
150 °C (heptahydrate, decomp)
2 °C (11-hydrate, decomp)

Solubility in wateranhydrous
269 g/L (0 °C)
255 g/L (20 °C) heptahydrate
710 g/L (20 °C)
Solubility0.116 g/L (18 °C, ether)
slightly soluble in alcohol, glycerol
insoluble in acetone
Refractive index (nD)1.523 (monohydrate)
1.433 (heptahydrate)
Crystal structuremonoclinic (hydrate)
EU IndexNot listed
Other cationsBeryllium sulfate
Calcium sulfate
Strontium sulfate
Barium sulfate

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