Experiment 10

Gravimetric Analysis

Aim : To determine the number of moles of water of crystallization in hydrated
magnesium sulphate .

Directions : Weigh a crucible and add between 7.5 and 8.0 grams of the hydrated 
magnesium sulphate . Heat the crucible and contents in an oven for 2 hours .
Remove and allow to cool in a desiccator . Reweigh . 
Repeat the heating / cooling / reweighing until the mass is constant .

Questions

Why was the crucible and content weighed to constant mass ?
Why was the crucible allowed top cool in the desiccator ?

SKILLED ASSESSED : ANALYSIS & INTERPRETATION

Discussion of Questions		3 mks
Results				1 mk
Calculations			4 mks
Answer				2 mks