ChromatographyL/O :- To understand chromatography,

and how it works

Chromatography can be used to separate dissolved substances

Substances which dissolve well move further up the filter paper

Chromatography• Look at the chromatography results: -

blue purple red blue purple red

solvent

start line in pencil

chromatography paper

completed chromatogramchromatography apparatus at start

Why is the start line drawn in pencil?In which direction did the molecule move?Why is the ink drawn well above the solvent level?

Purple is made up of blue and red dye. Where would the red appear on our chromatogram?

blue purple red blue purple red

solvent

start line in pencil

chromatography paper

completed chromatogramchromatography apparatus at start

The start line is drawn in pencil so more colour spots are not added!The molecules moved upwardsThe ink is drawn well above the solvent level to stop it dissolving in the solvent

Purple is made up of blue and red dye. The red dot would appear as shown

R G B X

ChromatographyChromatography can be used to separate a mixture of different inks. Some example questions…

1 2 3 Z

1) Ink X contains two different colours. What are they?

2) Which ink is ink Z made out of?