1. PERCENT OF WATER IN COPPER II SULFATE PENTAHYDRATE

2. Header
Chemistry Name________________ Experiment #8 Section_____Date_____ Percent of Water in Copper II Name(s) of Lab Partner(s) Sulfate Pentahydrate

3. Objective
To calculate the percent of water in a hydrate

4. Lab Safety

5. Procedure Mass a dry watch glass Add a small scoop of blue hydrate
Mass the watch glass and hydrate
Heat the hydrate on hot plate until all blue is gone
Remove watch glass from hot plate, turn off hot plate
Allow watch glass to cool
Mass the watch glass and anhydrate
Carefully add a few drops of water to the watch glass and observe.
Clean up.

6. Data
Mass of watch glass ______
Mass watch glass and hydrate ______
Mass watch glass and anhydrate ______

7. Observations
Before heating- (skip 3 lines) During heating- (skip 3 lines) After adding water- (skip 3 lines)

8. Calculations Percent of water in CuSO4 · 5 H2O
1. Amount of hydrate = __________
2. Amount of anhydrate = _________
3. Amount of water = _________
4. Mass of CuSO4 · 5 H2O
5. Percent water = mass of water / mass of CuSO4 · 5 H2O

9. Calculations Actual percent of water in CuSO4 · 5 H2O
Percent water in your experiment
Percent error
Percent error = % actual–% experimental X = %
actual %

10. Conclusion
The mass percent of water in copper sulfate pentahydrate is _____________. The actual percent is ________. My percent error is __________. Two sources of error include __________.