1. Visit this thread to beta-test StudySchedule.org. StudySchedule is a free nonprofit site that builds dynamic MCAT study schedules unique for your needs and timeline.
Hey, Guest, do you know how much will it cost you to apply to medical school? Check out SDN's Medical School Application Cost Calculator and plan your budget.

Acid equilibrium constant confusion

Discussion in 'MCAT Study Question Q&A' started by bentonj002, Oct 30, 2014.

  1. SDN is made possible through member donations, sponsorships, and our volunteers. Learn about SDN's nonprofit mission.
  1. bentonj002


    Jul 2, 2014
    I know that Ka = [H+][A-]/[HA]. By that equation Ka would also = [H+]^2/[HA] since when HA dissociates it dissociates into equal parts H+ and A- correct? I think I'm just over thinking the whole thing, but I would just like to make sure. Thank you.
  2. SDN Members don't see this ad. About the ads.
  3. Cawolf

    Cawolf 2+ Year Member

    Feb 26, 2013
    It would if it was dissolving in a solution of pure water.

    But since you want to apply the mass expression to buffers and non-pure solutions it is best to see how common ions effects the acid dissociation.

    So if you put the acid in a solution that already contained protons, you need to proper expression to calculate the dissociation.
  4. bentonj002


    Jul 2, 2014
    Ok, that's what I thought. Thank you for clearing that up for me.

Share This Page