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magnesium sulfate

Molecular formula------MgSO4 and MgSO4·7H2O

Molar mass------120.415 g/mol (anhydrous)

                       246.47 g/mol (heptahydrate)

Density ------2.66 g/cm3 (anhydrous)

                  2.445 g/cm3 (monohydrate)

                  1.68 g/cm3 (heptahydrate)

Melting point------1124 °C (anhydrous, decomp)

                         200 °C (monohydrate, decomp)

                         150 °C (heptahydrate, decomp)

Solubility in water------anhydrous26.9 g/100 mL (0 °C)

                                               25.5 g/100 mL (20 °C)

                                Heptahydrate71 g/100 mL (20 °C)

Solubility------0116 g/100 mL (18 °C, ether)

slightly soluble in alcohol, glycerol insoluble in acetone

Magnesium sulfate (or magnesium sulphate) is a chemical compound containing magnesium and sulfur, with the formula MgSO4. In its hydrated form the pH is 6.0 (5.5 to 6.5). It is often encountered as the heptahydrate, MgSO4·7H2O, commonly called Epsom salt. Anhydrous magnesium sulfate is used as a drying agent. Since the anhydrous form is hygroscopic (readily absorbs water from the air) and therefore harder 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 sulfate