Magnesium sulfate (Epsom Salt) is a chemical compound, a salt with the formula MgSO4, consisting of magnesium cations Mg2+(20.19% by mass) and sulfate anions SO2−4. It is a white crystalline solid, soluble in water but not in ethanol. Magnesium sulfate is usually encountered in the form of a hydrate MgSO4·nH2O, for various values of n between 1 and 11. The most common is the heptahydrate MgSO4·7H2O, known as Epsom salt, a household chemical with many traditional uses, including bath salts.
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