1. Select orange/red/complementary colour for filter
2. Make up/use dye solutions of different known/standard
concentrations
3. Measure the absorbance/transmission/transmittance of
the dye solutions of different known concentrations
OR absorbance/transmission/transmittance of the blue dye
solution
4. Plot calibration…
Page 3
Thin Layer Chromatography (June 2012) 5 marks
1. draw pencilline near bottom of plate and place 1 drop (or
similar word) of mixture (and a drop of each of the 3
compounds) on the line
2. place plate in solvent, line above solvent level AND add
lid/cover
3. when solvent…
Page 4
Recrystallisation (June 2010) 5 marks
Any four from:
1. Heat the (impure) sample with solvent / use hot/warm
solvent
2. with a minimum amount (of solvent) / add solvent to solid
until just dissolves
3. filter
4. leave filtrate/solution/mixture to cool / leave to crystallise
5. filter off crystals, wash…
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