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If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate...

If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?

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