About the ads

  1. Check out PREMED.me!
    Offers FREE service to help premeds manage their applications and MCAT study calendars and identify schools to target.

"Normal" for concentration

Discussion in 'MCAT Study Question Q&A' started by dougkaye, Feb 3, 2011.

  1. SDN is a nonprofit organization. Services are made possible through the generous support of SDN members and sponsors. Thank you.
  1. dougkaye

    dougkaye

    Joined:
    Apr 23, 2010
    Messages:
    132
    SDN 2+ Year Member

    SDN Members don't see this ad. (About Ads)
    BR Chem mentions this - never came up during Chem 1,2 and isn't in EK at all - curious if we need to worry about this. For example a 1.0 M diprotic acid solution would be listed as 2.0 normal b/c 2 equivalents of acid. Thanks.
  2. Rabolisk

    Rabolisk

    Joined:
    Jun 18, 2010
    Messages:
    862
    That's right. 1M of a diprotic acid = 2N concentration > 1M of a monoprotic acid = 1N concentration, reflecting the fact that even though those two acids have the same molar concentration, the diprotic acid has twice the protons, or twice the reactive species (since we are concerned about protons for acids). I'm trying to remember if I've seen this on the MCAT, but regardless, it's not a hard concept to remember, so I would learn it.
  3. dougkaye

    dougkaye

    Joined:
    Apr 23, 2010
    Messages:
    132
    SDN 2+ Year Member
    That's true. and even if the terminology of Normal isn't used, it helps to reinforce that the diprotics need two equivalents of strong reagent to neutralize them in a titration. Thanks!

Share This Page


About the ads