A laboratory analyses sample M by paper chromatography, using the same type of paper but two different solvents.
| Solvent | Rf value(s) of spot(s) from M |
|---|---|
| Solvent 1 | 0.44 |
| Solvent 2 | 0.28, 0.71 |
Explain what the results show about the purity of sample M and why the pattern is different in the two solvents.
102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.