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solubility rules

Discussion in 'MCAT Discussions' started by glia25, May 12, 2009.

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  1. glia25

    glia25 7+ Year Member

    Nov 14, 2008
    Are they worth the memorization?
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  3. SAEbrodel

    SAEbrodel 2+ Year Member

    Jan 13, 2009
    i'm wondering the same thing, i also noticed that EK and TPR differ on their rules, anyone know the REAL rules for solubility. Thanks.
  4. FIREitUP

    FIREitUP 10+ Year Member

    Jul 31, 2007
    i don't know, because i noticed some inconsistencies myself. probably not important. whenever you see a solubility problem think common ion effect.
  5. Longshanks

    Longshanks 7+ Year Member

    Apr 4, 2009
    New York
    Kaplan has a long list of all the rules, but I could just never get my head around them. Too many exceptions to the rules to the point where ... are there any rules?
  6. rockaction

    rockaction casemed'14

    May 2, 2009
    I'd say be familiar. There's no telling whether you could get a question or two that could easily be answered with knowledge of a couple rules. I forget them now, but my TPR book had a couple that were worth putting to memory.
  7. sv3

    sv3 2+ Year Member

    Feb 24, 2009
    I have the same issue...so many rules and exceptions. I get the drift and don't plan to memorize but reading them over 48 hrs before the exam could help retain in for the short term.
  8. combatwombat

    combatwombat 7+ Year Member

    Jul 19, 2008
    As I recall, MCAT solubility just came down to whether the molecule was charged or not. Charged = soluble in polar stuff; non-charged = soluble in non-polar stuff
  9. JJMrK

    JJMrK J to the J Moderator Emeritus 7+ Year Member

    Apr 26, 2007
    You mean memorizing this?

    Probably not worth it.

    I'd go with this.
  10. Vihsadas

    Vihsadas No summer Moderator Emeritus Lifetime Donor 5+ Year Member

    Oct 17, 2007
    An Igloo
    FWIW, YES! Memorize the solubility rules, but be aware that you get slightly different versions based on whether you are reading Kaplan, TPR, or etc. So, it's important to remember that the solubility rules are not a binary thing. It's a spectrum of solubilities, and where one person defines "insoluble" may not be the same as where another person defines "insoluble". You should definitely know the basic rules, and if you have time, learn exactly why: i.e. "A phosphate of X, Y, Z is soluble/insoluble because ____"
    Last edited: May 13, 2009
  11. BBender716

    BBender716 Med school drop out! 2+ Year Member

    Jan 11, 2009
    Also, I'd say know the really really obvious ones like all nitrates being soluble and pretty much all ammonium containing compounds and alkali compounds being soluble. Also, know common-ion effect as suggested about and how solubility constants read.
  12. Prince Abubu

    Prince Abubu 10+ Year Member

    Mar 2, 2007
    in EK Audio Osmosis they say that it's not needed, but they talk about it anyway.

    If I recall correctly, there was one or two questions on previous AAMCs that dealt with solubility

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