Which is the correct name for MgSO4•7H2O?

MgSO₄ is magnesium sulfate, and the dot followed by 7H₂O means seven water molecules are associated with each formula unit. A compound with seven waters is named a heptahydrate, so the correct name is magnesium sulfate heptahydrate. “Anhydrous” means no water, while “monohydrate” means one water.

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