 |
 |
12 of 17 |  |
 |
 |
C-12
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)
Mass of test tube + sample
Mass of hydrate sample
C.
Mass of test tube + sample
(after first heating)
(after second heating)
(after third heating - if necessary)
Mass of anhydrous sample (after heating)
Change in mass (i.e. mass of H2O lost)
Description of final anhydrous residue:
Calculate the mass percent of water in the unknown hydrate. (2.0 marks)
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?
