The Formula for a Hydrate - PowerPoint PPT Presentation

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The Formula for a Hydrate

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Title: The Formula for a Hydrate


1
The Formula for a Hydrate
  • Objectives
  • 6.0 Solve stoichiometric problems involving
    relationships among the number of particles,
    moles, and masses of reactants and products in a
    chemical reaction.
  • 6.5 Determining the empirical or molecular
    formula for a compound using percent composition
    data

2
Naming Hydrates
  • Definition a compound with a specific number of
    water molecules attached to its atoms
  • Use prefixes to indicate the number of water
    molecules compound prefixhydrate
  • Na2CO310H2O ????
  • CaSO42H2O ????

3
Determining the Formula of a Hydrate
  1. Heat a sample to drive off all the water.
  2. Subtract the ending mass from the beginning mass.
  3. The ending mass is the mass of the anhydrous
    compound.
  4. The difference is the mass of the water.
  5. Convert both masses to moles. ?
  6. To find the NUMBER of water molecules in the
    hydrate
    x moles
    H2O/moles anhydrous compound

4
Calculating the Formula for a Hydrate
  • Examples p.340 (63, 64)
  • Practice Problems P.349 (151-154)
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