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Colorimetry (Jan 2013) 6 marks

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Colorimetry (Jan 2011) 6 marks

Any 6 marking points from the following 7:

1. Select orange/red/complementary colour for filter

2. Make up/use dye solutions of different known/standard

3. Measure the absorbance/transmission/transmittance of
the dye solutions of different known concentrations
OR absorbance/transmission/transmittance of the blue dye

4. Plot calibration…

Page 3

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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

3. when solvent…

Page 4

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Recrystallisation (June 2010) 5 marks

Any four from:
1. Heat the (impure) sample with solvent / use hot/warm

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…

Page 5

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6. constant halflife = first order


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