| Magnesium sulfate | |
|---|---|
| General | |
| Systematic name | Magnesium sulfate heptahydrate |
| Other names | Epsom salts bitter salts |
| Molecular formula | MgSO4·7H2O |
| Molar mass | 120.3 g/mol |
| Appearance | white crystalline solid |
| CAS number | * |
| EINECS number | ? |
| Properties | |
| Density and phase | g/cm3, solid |
| Solubility in water | 25.5 g/100 ml (20 °C) |
| In ethanol | Slightly soluble (anh.) Insoluble (hydrate) |
| Melting point | °C decomp. |
| Structure | |
| Coordination geometry | ? |
| Crystal structure | monoclinic (hydrate) |
| Safety data | |
| PEL-TWA (OSHA) | — |
| RTECS number | ? |
| Supplementary data page | |
| Structure & properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other cations | Calcium sulfate Aluminium sulfate |
| Related compounds | |
| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Chemical infobox | |
Magnesium sulfate or Magnesium sulfate heptahydrate or Epsom salt is a chemical compound containing magnesium, with the formula MgSO4·7H2O. Magnesium sulfate without water of crystalization MgSO4 is available as a far less common chemical and drying agent, but typically "magnesium sulfate" refers to the hydrate, and Epsom salt always refers to the hydrate. In medical preparations the hydrate form is used to prepare and label even magnesium sulfate formulas in water solution, because the hydrate crystals, which are not deliquescent, are far more easily weighed and subject to quality control in manufacture.
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