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8.1 Purity, formulations and chromatography

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Question 31

A red substance, U, was extracted from beetroot and a red substance, V, was extracted from red cabbage.

For each experiment, U and V were run on the same chromatography paper in the same solvent.

ExperimentRf R_f\,Rf​ value of URf R_f\,Rf​ value of V
Solvent 10.460.46
Solvent 20.240.63

Which conclusion is correct?

[1]
A

The different values in solvent 2 show that U and V are different substances, although they matched in solvent 1

B

The matching values in solvent 1 show that one of the values measured in solvent 2 was incorrect

C

V travelled further in solvent 2 because it was more strongly attracted to the chromatography paper than U

D

U travelled less in solvent 2 because it was more soluble in the solvent than V

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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