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TLC

Discussion in 'MCAT Discussions' started by whatwhy, Jan 14, 2014.

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  1. whatwhy

    whatwhy 2+ Year Member

    107
    2
    Jul 7, 2013
    So i'm a little confused about TLC. I understsand the polar and non-polar aspects of it and all that, but sometimes in questions they will only state that the stationary phase is polar, but never say anything about the mobile phase. So what if the stationary phase and mobile phase are both polar or non-polar? How should I answer if, for example, I'm asked whether a less polar or more polar substance will travel further up a polar TLC plate, but never given the polarity of the mobile phase?

    AHHHHHHHHHHHHH Thanks.
     
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  3. FourEyes91

    FourEyes91

    14
    1
    Jan 2, 2014
     
  4. FourEyes91

    FourEyes91

    14
    1
    Jan 2, 2014
    Well, that was weird. Anyway, this is what I think.

    The less polar substance will travel further. The polarity of the mobile phase is less than the polarity of the stationary phase. Generally, the mobile glass will exhibit low polarity.
     

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