1. Match the correct description to the separation technique.
7H Separation techniques - Summary
Match the correct description to the separation technique.
Description
A…is used to separate small amounts of two or more solids which are soluble in the same solvent.
B…is used to separate a soluble solid from the liquid to obtain the solute.
C…is used to separate a soluble solid and a liquid to obtain the solvent.
D…is used to separate an insoluble solid from a liquid.
Name
1 Evaporation…
2 Filtration…
3 Chromatography…
4 Distillation…

2. boiling condensing collecting
7H Separation techniques – Distillation
How can you separate the solvent from the solids dissolved in a solution?
The best method to separate and collect the solvent from a solution is distillation.
Distillation involves three stages:
boiling
condensing
collecting
TEACHER’S NOTES
- discuss other methods so far
- filtration, evaporation, chromatography

3. 7H Separation techniques – Distillation
Where in the distillation equipment do boiling, condensing and collecting take place?
thermometer
Liebig condenser
boiling
gas cools and condenses
flask with mixture
water in
liquid boils off
water out
heat
one of liquids in mixture
gas turned back to a liquid
heat mat

4. 1. Hot gas passes down the inner tube.
7H Separation techniques – Distillation
The most important piece of kit for distillation is the Liebig condenser.
water in
water out
2. Cold water in the outer tube cools the hot gas, which condenses to become a liquid.
1. Hot gas passes down the inner tube.
3. The liquid is collected at the bottom.
Cold water enters the outer tube at the bottom
and warm water leaves the outer tube at the top.
Why does this happen?

5. Watch the demo on fractional distillation:
Explain what is happening at each stage, in your own words.
Use the keywords from today.

6. Explain how this equipment can be used to prove that ink is made from a coloured solid and water.