PERCENT OF WATER IN COPPER II SULFATE PENTAHYDRATE

PERCENT OF WATER IN COPPER II SULFATE PENTAHYDRATE

Chemistry Experiment # _____ Percent of Water in Copper II Sulfate Pentahydrate Name________ Section_____Date_____ Name(s) of Lab Partner(s)

Objective � To calculate the percent of water in a hydrate

Procedure 1. 2. 3. 4. 5. 6. 7. 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 Allow watch glass to cool Mass the watch glass and anhydrate 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 Cu. SO 4 · 5 H 2 O � 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 Cu. SO 4 · 5 H 2 O � 6. Percent error **hint – set up the table with percent composition for water** �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 _____.