Part A. Name the hydrate MgSO4⋅7H2O.
Hydrates are solid compounds that contain water molecules. When hydrates are heated, the water molecules evaporate, producing the anhydrous form of the compound. The formula of a hydrate may be written in two different ways. For example, aluminum chloride hexahydrate can be written as [Al(H2O)6]Cl3 or as AlCl3⋅6H2O. The first formula more accurately shows the bonding arrangement, whereas the second formula makes it easier to see that the anhydrous form of the compound is aluminum chloride.
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