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8.1 Purity, formulations and chromatography

8.1 Purity, formulations and chromatography

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Question 11

During a paper chromatography experiment to analyze food colorings, a student records the following measurements:

  • The spot of yellow dye moves 4.5 cm4.5\text{ cm}4.5 cm from the start line.
  • The solvent front moves 7.5 cm7.5\text{ cm}7.5 cm from the start line.

Calculate the RfR_fRf​ value for the yellow dye.

Use the equation:

Rf=distance moved by substancedistance moved by solvent R_f = \frac{\text{distance moved by substance}}{\text{distance moved by solvent}} Rf​=distance moved by solventdistance moved by substance​
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Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

28 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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