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8.1 Purity, formulations and chromatography

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Question 9
F

A chromatogram is run again using the same dye, the same paper and the same solvent, but the solvent is allowed to travel twice as far up the paper.

What happens to the Rf R_f\,Rf​ value of the dye?

[1]
A

It doubles, because the spot moves twice as far

B

It halves, because the solvent moves twice as far

C

It decreases, because the spot spreads out more

D

It stays the same, because both distances increase in proportion

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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