1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Logarithm problem, differences!

  1. Apr 11, 2013 #1
    I feel so dumb. I cannot figure out this relationship for the life of me.

    pH= -log[H+]

    Imagine 2 concentrations. If the hydronium ([H+]) concentration differs by a factor of 2, it means the pH of the 2 solutions differs by -log √2


    So basically, what they're saying is

    Last edited: Apr 11, 2013
  2. jcsd
  3. Apr 11, 2013 #2


    Staff: Mentor

    where did you get the sqrt(2) from?

    they actually differ by the log(2).

    2 * 0.05 = 0.1 and in log form: log(2) + log(0.05) = log(0.1)

    hence log(2) = log(0.1) - log(0.05)
  4. Apr 11, 2013 #3

    Okay....after more thought, I am convinced my solutions manual is wrong. I hate how many errors are in these things. Thanks jedishrfu.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook