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8.1 Purity, formulations and chromatography

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Question 6
H

Substance J was analysed by paper chromatography in two different solvents. In solvent 1, substance J produced one spot. In solvent 2, substance J produced two spots.

a.

Explain what these results show about substance J.

[2]
b.

Explain why a compound can have a different Rf R_f\,Rf​ value in a different solvent.

[2]
c.

Give one reason why chromatography alone cannot always identify a compound.

[1]
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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