Name: ____________________________________Period: _____ Date:____________

Lab 9: Formula of a Hydrate Lab

Purpose: To utilize mole conversions to determine the ratio between copper (II) sulfate molecules and water of hydration.

Materials:1 Hot Plate 1 Wire Mesh1 Small beaker 1 Glass Stirring Rod1 Electronic Scale 1 Crucible TongCopper II Sulfate Hydrate (approx. 5g)

Procedure:

1. Mass small beaker (empty)

2. Obtain approximately 5 grams of Copper II sulfate hydrate

3. Put hydrate in beaker and find the mass.

4. Turn hot plate on medium high.

5. Place beaker and copper II sulfate hydrate on hot plate.

6. Very carefully stir hot material occasionally with glass rod.

7. Heat until blue color is gone.

8. Turn off hot plate and unplug.

9. Let beaker cool until you can handle it.

10. Mass beaker and copper II sulfate anhydrate.

11. Wipe out beaker into trash and wash out.

12. Clean up lab station.

13. Perform calculations.

Data:

Mass of Empty Beaker(g)Mass of Beaker & CuSO4

. nH2O (g)Mass of Beaker and CuSO4 (g)

NOTES

Calculations: You must show all work for complete credit.

Determine the mass of Copper II Sulfate Hydrate.Using the mass of the beaker only and the mass of the beaker with copper II hydrate, determine the mass of the blue copper II sulfate hydrate.

________________g CuSO4.XH2O

Determine the mass of Copper II Sulfate AnhydrateUsing the mass of the beaker and the mass of the beaker with copper II anhydrate, determine the mass of the copper II sulfate anhydrate.

_________________g CuSO4

Determine the mass of water lost from Hydrate.Using the mass of the copper II sulfate hydrate and the mass of the copper II sulfate anhydrate, determine the mass of water lost from the hydrate.

__________________g H2O

Determine the number of moles of copper II sulfate anhydrate, CuSO4.Using the mass of copper II sulfate anhydrate and the molar mass from the periodic table, determine the number of moles of copper II sulfate used in your experiment.

__________________ mol CuSO4

Determine the number of moles of water.Using the mass of water lost and the molar mass from the periodic table, determine the number of moles of water of hydration.

__________________ mol H2O

Determine the mole ratio of Copper II Sulfate and Water.Using the number of moles of copper II sulfate and moles of water, determine the smallest whole number ratio.

Ratio _____to _____

Write the formula of Copper II Sulfate HydrateCuSO4 . _____ H2O

Conclusion

By heating __________ grams of copper II sulfate _______________, it was calculated that __________ grams of water were lost. With a mass of __________ grams for the anhydrate, it was determined that the mole ratio of copper II sulfate to water is ___:___. From this, it can be stated that the formula for the hydrate is _______________. The actual formula for the hydrate is _______________. Our ratio was ____________ to that of the actual formula. Potential sources of error in this lab could be ______________________