Topic 6 : Practical aspects

Question 1

Test for purity of liquids

Answer 1

• Measure the boiling temp

* Any impurities will raise the boiling temperature

Question 2

extraction with a solvent in a separating funnel

Answer 2

• Add the chosen solvent to form 2 layers in a separating funnel
• Add stopper and gently shake
• Allow the contents to settle into two layers
• Remove the stopper and allow the lower layer to drain into a flask and the upper into a different flask

Question 3

Drying with anhydrous salt

Answer 3

• Anhydrous calcium chloride to remove water
• The drying agent can be removed by
• Filtration
• Decanting