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8.1 Purity, formulations and chromatography

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Question 1

A scientist uses paper chromatography to analyse a pigment extracted from pondweed. The pigment is run on two different types of chromatography paper, A and B, using the same solvent. The pigment is less strongly attracted to paper B than to paper A.

Which prediction about the Rf R_f\,Rf​ value of the pigment is correct?

[1]
A

Lower on paper B, because the solvent moves past the weakly held pigment more quickly

B

Higher on paper B, because the solvent travels further up paper B in the same time

C

The same on both papers, because the pigment and the solvent have not been changed

D

Higher on paper B, because the pigment spends less of the time held on the paper

Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.

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