PPT Slide

• Ionic compounds called hydrates have a specific number of  water molecules associated with each formula unit.

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• Epsom salt has the formula MgSO4.7H2O and the name  magnesium sulfate heptahydrate.

• The mineral gypsum has the formula CaSO4.2H 2O and the  name calcium sulfate dihydrate.

• Learn the numerical prefixes in Table 2.6.

Families of Oxoanions

• Most polyatomic ions are oxoanions, in which an element,  usually a nonmetal, is bonded to one or more oxygen atoms.

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