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!

Homework Help: PH of HCl solution as a function of volume.

  1. Feb 27, 2012 #1
    1. The problem statement, all variables and given/known data
    You have a 1L of a 2M HCl solution. Assume that the HCl completely ionizes.
    a) Calculate the pH of the solution right now.
    b) You now add V litres of water to the solution.
    Find the pH of the new dilute solution in terms of V.

    2. Relevant equations
    pH = -log[H]

    3. The attempt at a solution
    a) pH = -log(2) which is interestingly a negative number so I hope this is correct.
    b) I'm not sure how you would do this part. Do we just find the new concentration in terms of V and then find the negative log of that? Don't we have to consider the autoionization of water?


  2. jcsd
  3. Feb 28, 2012 #2


    User Avatar

    Staff: Mentor

    Yes, negative pH is possible.

    Check the link I posted in your other thread for the way pH should be calculated. And read about dilution calculation.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook