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C-11
OBSERVATIONS & INFORMATION SHEET - EXPERIMENT C
HYDRATES
Part I.
A.
Unknown Sample Code:
Observation regarding gentle/intense heating of unknown hydrate
B.
Mass of test tube (dry)
g
Mass of test tube + sample
g
Mass of hydrate sample
g
C.
Mass of test tube + sample
(after first heating)
g
(after second heating)
g
(after third heating - if required)
g
Mass of anhydrous sample
g
Mass of H2O lost
g
Description of final anhydrous residue:
Part II.
A 1.
What evidence is there that water is present in the CuSO
4
crystal?
A 2.
Describe the difference in appearance and composition between the anhydrous residue and the
hydrate.
A 3.
What did you observe when water was added to the anhydrous salt?
B 1.
What evidence is there of the formation of water from sugar?
What is the brown/black residue?
B 2.
What did you see when water was added to the brown/black residue?
___________________________
_____________________________
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CALCULATE THE MASS PERCENT OF WATER
IN THE UNKNOWN HYDRATE IN THIS SPACE.
(2.0 MARKS)
