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8.1 Purity, formulations and chromatography

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Question 29

Dyes P and Q from two wool samples were tested on the same chromatography paper using solvent 1 and then solvent 2. Their Rf R_f\,Rf​ values were:

DyeSolvent 1Solvent 2
P0.280.64
Q0.280.64

Which conclusion is supported by these results?

[1]
A

P and Q may be the same substance because their RfR_fRf​ values match in both solvents

B

P and Q may each be pure substances because all four RfR_fRf​ values are below 1

C

P and Q may each be mixtures because two RfR_fRf​ values have been recorded for each dye

D

P and Q may be different substances because each RfR_fRf​ value changes when the solvent changes

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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