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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 12

Paper chromatography can be used to separate and identify the different dyes found in felt-tip pens.

Six steps for carrying out this chromatography experiment are listed below, but they are not in the correct order.

  1. Place the chromatography paper into the beaker, ensuring the solvent level is below the start line.
  2. Draw a start line in pencil near the bottom of the chromatography paper.
  3. Remove the paper from the beaker just before the solvent reaches the top and mark where the solvent reached.
  4. Add a small volume of solvent to the beaker.
  5. Place a small spot of each felt-tip ink on the pencil start line.
  6. Leave the beaker undisturbed as the solvent travels up the paper.

List the remaining steps in the correct order to complete the sequence.

The first two steps have been determined for you.

| 4 | 2 | | | | |

[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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