Description
Magnesium sulfate is an inorganic salt with the chemical formula MgSO4. It’s a colorless crystalline solid that is highly soluble in water and is most commonly known as its heptahydrate form, MgSO4⋅7H2O, which is also called Epsom salt.
Chemical Properties
| Physical Property | Description / Value |
| Molar Mass | 120.37 g/mol (anhydrous), 246.48 g/mol (heptahydrate) |
| Appearance | White crystalline solid |
| Odor | Odorless |
| Taste | Bitter (Epsom salt) |
| Density | 2.66 g/cm³ (anhydrous), 1.68 g/cm³ (heptahydrate) |
| Melting Point | 1124 °C (decomposes) |
| Boiling Point | Decomposes before boiling |
| Solubility in Water | Highly soluble (~35 g/100 mL at 20°C) |
| Solubility in Alcohol | Insoluble |
| Hygroscopicity | Can absorb moisture from air (especially anhydrous form) |
| Crystal System | Orthorhombic (heptahydrate) |
Uses
Magnesium sulfate has a wide variety of uses across different industries:
Medical and Pharmaceutical:
Laxative: Orally, it’s used for the short-term relief of occasional constipation.
Soaking Solution: As a topical solution, it’s used to relieve minor sprains, bruises, muscle aches, and tired feet.
Intravenous (IV) Administration: In a hospital setting, it’s used to prevent and control seizures in conditions like pre-eclampsia and eclampsia, as well as to treat magnesium deficiency and certain cardiac arrhythmias.
Agriculture: It is used as a fertilizer to correct magnesium or sulfur deficiencies in soil, particularly for crops like potatoes, roses, and tomatoes.
Industrial: It is used in the manufacturing of textiles and paper, and as a component in bath salts and flotation therapy.
Grades
The grade of magnesium sulfate depends on its intended application and purity. Common grades include:
ACS Reagent Grade: Meets the specifications of the American Chemical Society, meaning it has a high level of purity suitable for laboratory and analytical use.
USP Grade: Meets the standards of the United States Pharmacopeia, ensuring it is of sufficient purity for use in pharmaceutical, food, and medical applications.
FCC Grade: This is the Food Chemical Codex grade, which means it meets the purity standards for use as a food additive.
Technical/Agricultural Grade: This is a less pure grade, used primarily in agriculture and for industrial applications where high purity isn’t required.
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