PERCENT OF WATER IN COPPER II SULFATE PENTAHYDRATE

Chemistry Name________________

Experiment # _____ Section_____Date_____

Percent of Water in Copper II Name(s) of Lab Partner(s)

Sulfate Pentahydrate

Objective To calculate the percent of water in a

hydrate

Procedure1. Mass a dry watch glass2. Add a small scoop of blue hydrate3. Mass the watch glass and hydrate4. Heat the hydrate on hot plate until all blue is

gone5. Allow watch glass to cool6. Mass the watch glass and anhydrate7. Carefully add a few drops of water to the watch

glass and observe.8. Clean up.

Data Mass of watch glass

______

Mass watch glass and hydrate

______

Mass watch glass and anhydrate

______

Observations Before heating- (3)

During heating- (3)

After adding water- (3)

Calculations Percent of water in CuSO4 · 5 H2O

1. Amount of hydrate = __________

2. Amount of anhydrate = _________

3. Amount of water = _________

4. Experimental percent of water - ___________

Calculations, con 5. Actual Percent of Water in CuSO4 · 5 H2O

**hint – set up the table with percent composition for water**

6. Percent error Percent error = actual %– experimental % X 100

= ____ % actual %

Conclusion The mass percent of water in copper

sulfate pentahydrate is _____________. The actual percent is ________. My percent error is __________. Two sources of error include __________.