Objectives
1. To determine the percentage of water in an unknown hydrate.
2. To determine the moles of water present in each mole of this unknown hydrate when given the molar mass of the anhydrous salt.
3. To write an empirical formula of the hydrate.
Supplies
Equipment: lab burner, crucible and lid, crucible tongs, pipe stem triangle
1. To determine the percentage of water in an unknown hydrate.
2. To determine the moles of water present in each mole of this unknown hydrate when given the molar mass of the anhydrous salt.
3. To write an empirical formula of the hydrate.
Supplies
Equipment: lab burner, crucible and lid, crucible tongs, pipe stem triangle
Chemical reagents: approximately 5 g of a hydrate, water.
Procedures
1. Try to dry the crucible by heating it up, make sure the flame is blue
Procedures
1. Try to dry the crucible by heating it up, make sure the flame is blue
2. Remove the crucible and cool it for 3 mins
3. Determine mass of the crucible
4. Put in the hydrate, record the mass of crucible
5. Heat up for 5 mins
6. Cool it down for 3 mins then record the mass of crucible
Some more infomations
Hydrate is the compound containing water
Anhydrous is a substance contains no water.
Experiment’s errors:
1. Hydrate decomposed before heating finish
2. Water in air can affect the crucible’s mass
No comments:
Post a Comment