A trainee conservator used paper chromatography to test three coloured samples from old documents.
| Sample | Number of spots in solvent 1 | Number of spots in solvent 2 |
|---|---|---|
| L | 1 | 1 |
| M | 1 | 2 |
| N | 1 | Not tested |
The trainee concluded that all three samples were pure substances.
Evaluate the trainee's conclusions.
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.