Anhydrous magnesium sulfate is used as a drying agent. 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. Epsom salt can also be used as a beauty product. Athletes use it to soothe sore muscles, while gardeners use it to improve crops. It has a variety of other uses: for example, Epsom salt is also effective in the removal of splinters.
- Formula
- MgSO4
- Molar mass
- 120.366 g/mol
- CAS Number
- 7487-88-9
- Density
- 1.070 g/cm3
- Purity/Grade
- ≥97% (Reagent) Anhydrous
- Appearance
- granular, powder
- Vapour pressure
- <0.1 hPa (<0.1 mmHg) at 20°C (68°F)
- Water solubility
- ca.73.8 g/l at 100°C (212°F)