A student is choosing between two arrangements for paper chromatography. In both arrangements, the paper is lowered so its bottom edge dips into the solvent, and the sample is placed on the pencil origin line.
| Arrangement | Solvent depth above the bottom of the beaker | Origin line height above the bottom of the beaker |
|---|---|---|
| A | 1.0 cm | 2.0 cm |
| B | 2.0 cm | 1.5 cm |
Which arrangement should the student use?
Explain what would happen to the sample if the other arrangement were used.
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.