| Rules for Naming Hydrated Ionic Compounds | ||||||||||||||||||||||
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Hydrated ionic compounds have a specfic number of water molecules in their chemical formulas. In the solid, these water molecules (also called "waters of hydration") are part of the structure of the compound. Rule 1. The ionic compound (without the waters of hydration) is named first using the rules for naming ionic compounds. Rule 2. Greek prefixes (see the Table provided at the bottom of this page) are attached to the word "hydrate" to indicate the number of water molecules per formula unit for the compound. Rule 3. When the chemical formula for a hydrated ionic compound is written, the formula for the ionic compound is separated from the waters of hydration by a "dot".
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