| A | B |
|---|
| ink, paints and foods | contain mixtures of coloured compounds |
| chromatogram | paper with separated components |
| The solvent | is the mobile phase |
| The paper | contains the stationary phase |
| Rf value = | distance moved by spot / distance moved by the solvent |
| Rf values are always | less than 1 |
| If pink spots move 4cm and the solvent has moved 10cm | the Rf value will be 0.4 |
| If blue spots move 5cm and the solvent has moved 10cm | the Rf value will be 0.5 |
| The starting positions of the samples | should always be above the solvent line |
| the sample line | should be drawn in pencil |
