What is the Identity of this Hydrate?
May 30, 12
June 6, 2012
A hydrate was given to our group and the identity of the hydrate was unknown. The lab workers were told to determine the identity of the unknown hydrate. The identity of the hydrate could be determined by calculating the hydrate’s percent of water. So the lab workers set out to determine the water percent of the unknown hydrate.
The percent of any compound or element can be found by using a certain formula. This formula is: % of element = Mass of element or compound/Total mass of compound x100. In order to use this formula the mass of the water and the total mass of the hydrate had to be found. The lab workers were first given a test tube, test tube clamp, top loader electronic balance, Bunsen burner and unknown hydrate. First the lab workers inserted a small portion of the hydrate into the test tube. The test tube with the hydrate in it was inserted into the beaker. The beaker was used because it allowed the lab workers to weigh the test tube and the hydrate with ease. The weight of the test tube, beaker and hydrate were all found. The weight of the test tube and beaker were subtracted out of the total weight. The left over weight belonged to the hydrate. The hydrate was then burned by using the Bunsen burner; until there was no remaining water left. Once the water was thoroughly burned off, the left over anhydrous salt was weighted. The Bunsen burner was used because it provided heat, which evaporated the water of the hydrate. The weight of the anhydrous salt was subtracted from the total weight of Water Percent
| Hydrate Weight
| Anhydrous Salt Weight
| Salt Percent
| .0740 g
| 0.618 g
the hydrate. This calculation left the lab workers with the weight of the water. The total weight of the hydrate and the weight of the water were plugged into the percent formula; which determined the percent....
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