Analysing Chromatograms
Cards (7)
- Chromatographycan separate soluble coloured dyes (substances) in a mixture
- There are 2 phases in chromatography:
- stationary phase: paper (doesn't move)
- mobile phase: solvent (travels up the paper)
- Substances in the mixture that have a stronger force of attraction to the mobile phase will travel higher up the paper
- Substances in the mixture that have a stronger force of attraction to the stationary phase will not travel as high up the paper as those with a strong attraction to the mobile phase
- Rf valuethe ratio of the solutes distance travelled to the solvents distance travelled
- Rf value = distance travelled by substance/distance traveled by solvent
- The Rf value is always under 1