Details: 
Investigate how paper chromatography can be used to separate and tell the difference between coloured substances. Students should calculate Rf values

Techniques:
Use of appropriate apparatus to make and record a range of measurements accurately.
Safe use of a range of equipment to purify and/or separate chemical mixtures including chromatography.

Skills:
Carry out experiments appropriately having due regard for the correct manipulation of apparatus, the accuracy of measurements and health and safety considerations.
Make and record observations and measurements using a range of apparatus and methods.