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8.1 Purity, formulations and chromatography

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Question 17

A technician uses paper chromatography to separate coloured substances extracted from marigold petals.

After removing the chromatography paper from the beaker, why should the technician mark the solvent front immediately?

[1]
A

So it can be used as the line from which both chromatography distances are measured

B

So its position is recorded before the solvent dries and can no longer be seen

C

So it prevents the coloured spots moving any further while the paper is drying

D

So each coloured substance can be identified using the solvent-front distance alone

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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