Dismiss Notice

Interview Feedback: Visit Interview Feedback to view and submit interview information.

Interviewing Masterclass: Free masterclass on interviewing from SDN and Medical College of Georgia

Dismiss Notice
Hey Texans—join us for a DFW meetup! Click here to learn more.

quick orgo Q

Discussion in 'MCAT Study Question Q&A' started by doxycycline, Jan 4, 2009.

  1. swamprat

    Physician Classifieds Approved 10+ Year Member

    Joined:
    Jul 25, 2008
    Messages:
    1,617
    Likes Received:
    136
    Status:
    Attending Physician
    What does Rf(R sub f) mean? Its from a practice test :

    "Does the product have a higher or lower Rf than the starting material?"
     
  2. Note: SDN Members do not see this ad.

  3. Ibn Rushd

    10+ Year Member

    Joined:
    Aug 3, 2007
    Messages:
    373
    Likes Received:
    4
    Status:
    Medical Student
    I'm almost positive that it refers to the distance the solvent travels in TLC (thin layer chromatography).

    EDIT: A quick wiki read-through somewhat confirms what I said earlier. Rf, or retention factor, is the ratio of the distance the substance travels to the distance the solvent travels. If you remember doing TLC in ochem lab, it's a pretty easy concept to grasp. Say you dab the plate with some random solution and then you let the solvent migrate up the plate, these two components will each travel a unique distance from the "start" line you drew on the plate. The ratio of their distances is Rf.
     
    #2 Ibn Rushd, Jan 4, 2009
    Last edited: Jan 4, 2009
  4. swamprat

    Physician Classifieds Approved 10+ Year Member

    Joined:
    Jul 25, 2008
    Messages:
    1,617
    Likes Received:
    136
    Status:
    Attending Physician
    Thanks
     

Share This Page