Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dimensional Analysis and pH

  1. Jul 31, 2012 #1


    User Avatar

    This is something I've been wondering for a while, but I thought that the inputs for things like ln(x), e(x), sin(x), etc. had to be unitless. Then how come concentration, which has units of moles per volume (or I guess just per volume, since moles are just a number? I've never been sure about that...) is used as an input for log(x) to find pH, pOH, pKa, etc.?
  2. jcsd
  3. Jul 31, 2012 #2
    I've never thought about that myself.

    I would suspect it is because formula pH is defined as, pH=-log(a) where a is the activity of the hydrogen ion and activity is dimensionless.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Dimensional Analysis and pH
  1. PH problem (Replies: 1)

  2. PH and litmus (Replies: 3)

  3. PH scale (Replies: 1)