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8.1 Purity, formulations and chromatography

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Question 18

A researcher uses paper chromatography to separate coloured substances extracted from purple cabbage.

Which measurement forms the denominator when the Rf R_f\,Rf​ value of a coloured substance is written as a fraction?

[1]
A

Distance moved by the solvent

B

Distance between the spot and the solvent front

C

Distance from the origin line to the top of the paper

D

Distance moved by the coloured substance

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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