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!

Finding pH of solution knowing E°...

  1. Aug 27, 2015 #1
    1. The problem statement, all variables and given/known data
    The pair Ni2+/Ni has E°=-0.25V. Find the minimum pH of the sulution so that a nickel bar immersed in it, doesn't produce hydrogen.

    2. Relevant equations
    -

    3. The attempt at a solution
    This problem doesn't make any sense to me. Maybe there is a cell in which the following reaction occurs:
    2H+ + Ni ---> Ni2+ + H2

    I thought I could use something like the Nernts equation but I don't know [Ni2+].

    I need some guidance. Thank you.
     
  2. jcsd
  3. Aug 27, 2015 #2

    Borek

    User Avatar

    Staff: Mentor

    You don't need concentration of Ni2+ if the potential is given. Actually even the identity of the metal doesn't matter.
     
  4. Aug 27, 2015 #3
    Ok, this is what I get:

    -0.0591/2 * log( 1/[H+]2 ) + 0.25 < 0 [the reaction does not occur and hydrogen is not produced]
    pH > 8.46
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Finding pH of solution knowing E°...
  1. Find pH of solution (Replies: 1)

  2. Finding pH of solution (Replies: 2)

  3. Finding PH of solution (Replies: 20)

Loading...