AQA A Level Chemistry

Revision Notes

7.11.5 Interpreting Chromatograms

Interpreting Chromatograms

  • The less polar components travel further up the TLC plate
    • Their Rf values are higher than those closer to the baseline
    • They are more soluble in the mobile phase and get carried forwards with the solvent
  • More polar components do not travel far up the plate
    • They are more attracted to the polar stationary phase
  • The extent of separating molecules in the investigated sample depends on the solubility in the mobile and stationary phases
  • Knowing the Rf values, of compounds being analysed, helps to compare the polarity of various molecules
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