CAPE Chemistry Unit 2 · 2012 · Paper 2 · Question 2(a)
Separation techniques using chromatography.
State ONE use of chromatography in criminal investigations.
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- 2(b)Outline FOUR essential experimental steps in the separation of the components of a dye using thin-layer chromatography (TLC).[4 marks]
- 2(c)Define the terms 'stationary phase' and 'mobile phase' in relation to thin-layer chromatography (TLC).[2 marks]
- 2(d)Name TWO materials commonly used as the stationary phase in TLC.[2 marks]
- 2(e)(i)Calculate the Rf values of components A and B using the measurements provided in Figure 1.[2 marks]
- 2(e)(ii)Suggest TWO reasons for the difference in the Rf values of A and B.[2 marks]
- 2(e)(iii)State TWO factors, other than the distance travelled by the solvent, which influence the Rf value of a solute.[2 marks]
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