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Calculating the Formula for a Hydrate

Calculating the Formula for a Hydrate. Ch. 11, Section 5. Hydrate. A compound that has a specific number of water molecules bound to its atoms EXAMPLES: MgSO 4 . 7H 2 O Na 2 CO 3 . 10H 2 O. Steps to determining the formula for a hydrate.

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Calculating the Formula for a Hydrate

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  1. Calculating the Formula for a Hydrate Ch. 11, Section 5

  2. Hydrate • A compound that has a specific number of water molecules bound to its atoms EXAMPLES: MgSO4.7H2O Na2CO3. 10H2O

  3. Steps to determining the formula for a hydrate • Write down ALL information, including the hydrated compound and the anhydrate • Subtract: mass of hydrate – mass of anhydrate = g H2O • Find the moles of the anhydrate AND the moles of the H2O • Divide by the smaller # from #3’s calculation • Write the formula, using a dot to attach the water • Write the name of the hydrate

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