chemistry

How can you tell which mobile phase is more polar in TLC? (hexane/ethyl acetate/ethanol vs. isopropanol/ammonia)? the hexane/ethyl acetate/ethanol travelled up the TLC faster, does this make it more polar?

asked by L
  1. What's the substrate on the TLC? SiO2? If so that is polar and it should hold the more polar components back (travel slower). My best intuition thinks that ammonia would be more polar than ethanol.

    posted by DrBob222
  2. the TLC is silica gel

    posted by L
  3. Since the substrate is silica gel (SiO2), that is a polar substrate and the more polar solvent should move slower than the less polar solvent.

    posted by DrBob222
  4. thank you!

    posted by L

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