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3.2 Methods of separating and purifying substances

3.2 Methods of separating and purifying substances

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Question 56

An environmental chemist uses thin-layer chromatography (TLC) to identify a pesticide residue, P-12, in a soil extract.

In the mobile phase used, pesticide P-12 has a retention factor (RfR_fRf​) value of 0.78.

Calculate the distance moved by the spot of pesticide P-12 if the solvent front has moved 12.4 cm from the baseline.

Give your answer to 1 decimal place.

[2]
Markscheme

3.2 Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Methods of separating and purifying substances

107 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.

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