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8.1 Purity, formulations and chromatography

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Question 14

Two colourings, A and B, were tested on the same chromatography paper using solvent 1 and then solvent 2. Their Rf R_f\,Rf​ values were:

ColouringSolvent 1Solvent 2
A0.420.36
B0.420.71

Which conclusion is supported by these results?

[1]
A

Colouring A is a mixture because its RfR_fRf​ value changes between solvents

B

Colouring B is impure because its RfR_fRf​ value is greater in solvent 2

C

The colourings are different substances because their RfR_fRf​ values differ in solvent 2

D

The colourings are the same substance because their RfR_fRf​ values match in solvent 1

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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