Separating Mixtures
Name ___________________________
A homogeneous mixture is ______________________________________________________
(Pgs 621- 622)
A heterogeneous mixture is ______________________________________________________
1. Chromatography
Paper chromatography can be used to separate mixtures of colours, water is the most common
solvent for this but propanone and ethanol can also be used.
Method
1. Place 20cm3 of the solvent (water) in a small beaker.
2. Draw a pencil line 3cm up on a 12cm long strip of chromatography paper.
3. Make a small dot on the pencil line with each colour you wish to test. Allow the dots to
dry.
4. Put the paper strip into the water, the pencil line should be at the bottom of the strip
but not in the water.
5. Put a pencil across the top of the beaker and rest the top of the paper on this (you might
need to tape it).
6. Allow time (at least 5 minutes, carry out another experiment while you wait) for the
chromatography to take place.
Labelled Diagram
My question to investigate:
____________________________
____________________________
This is a heterogeneous/ homogeneous
mixture.
Results:
2. Separating Chalk From Water
Labelled Diagram
This is a heterogeneous/ homogeneous mixture.
Physical property used for separating:
___________________________________
Results:
JS2009 Separating Mixtures
3. Separating Sand and Iron Filings
Labelled Diagram
This is a heterogeneous/ homogeneous mixture.
Physical property used for separating:
___________________________________
Results:
4. Obtaining Copper Sulphate From Copper Sulphate Solution
Labelled Diagram
This is a heterogeneous/ homogeneous mixture.
Physical property used for separating:
___________________________________
Results:
Extension Exercises
Choose one of the following problems to investigate, write down how you will carry out your
investigation. You should do this neatly in your exercise book. When your teacher has checked
your plan, then you may start your experiment. Remember to record your results and any
modifications you need to make to your plan.
5. How can we obtain clean water from dirty water?
6. Do all lipsticks of the same colour contain the same dyes?
7.What are the proportions of salt and chalk in the mixture? You will need to separate them to
find out.
JS2009 Separating Mixtures