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8.1 Purity, formulations and chromatography

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Question 26
H

The same dye gives an Rf R_f\,Rf​ value of 0.31 in one solvent and 0.68 in a different solvent.

Why are the two Rf R_f\,Rf​ values different?

[1]
A

The dye is impure, so it behaves differently in each experiment

B

The paper used as the stationary phase has been changed

C

The dye moves further when the solvent front moves further

D

The dye is distributed differently between the phases in each solvent

Markscheme

8.1 Purity, formulations and chromatography Questions

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

40 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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