Lab 4C- Formula of a Hydrate

OK, so last Tuesday, all we did was have our quiz on percent composition, empirical formula and molecular formula.
Then last Thursday, we did Lab 4C- Formula of a Hydrate. This lab was done to determine the percentage of water in an unknown hydrate and to determine the moles of water presnt in this unknown hydrate.

First of all, we heated the crucible with a bunsen burner for a couple of minutes to make sure it was dry.

Then, we let the crucible cool down and weighed the empty crucible. We then added the hyrdate to the crucible and weighed it again. After, we heated the crucible until it was dull red on the bottom and waited for it to cool down and weighed it again. We repeated this step again- the second reading of the mass hydrate should have been within 0.03 grams of the first reading.

Finally, we added a few drops of water into the crucible and observed the changes.