PRE-LAB ASSIGNMENT: Practice Calculations
Use the data provided to complete the following calculations in your lab notebook:
DATA 1:
Mass of empty crucible
22.49 g
Mass of crucible + hydrate 26.70 g
(before heating)
Mass of crucible . anhydrous salt 25.82 g
(after first heating)
Mass of crucible + anhydrous salt 25.81 g
(after second heating)
a. Determine the mass of hydrate used.
Mass of hydrate (Mass of crucible + hydrate before heating) - (Mass of empty crucible)
b. Determine the mass of anhydrous salt.
Mass of anhydrous salt - (Mass of crucible - anhydrous salt after final heating) - (Mass of empty
crucible)
c. Determine the mass of water.
Mass of water - (Mass of hydrate)-(Mass of anhydrous salt)
d. Determine the percentage of water in the hydrate.
% water - Mass of water x 100
Mass of hydrate