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Buffer/Ph/titration problem

  1. Apr 15, 2009 #1
    1. The problem statement, all variables and given/known data
    20.0 mL of a 0.1 M solution of sodium hydroxide is titrated into 50.0 ml of the 0.14 M HOBr solution. Calculate the pH of the resulting solution.

    ph of HOBr is 4.74

    Ka is 2.3e-9


    2. Relevant equations

    [H+] = ka(a/b)

    -log[h+] = ph

    ka*kb=kw


    3. The attempt at a solution

    honestly i have no clue how to do this problem. I already know the answer its 8.24, but I haven't a clue how to get it. can someone point me in the right direction?

    thanks
     
  2. jcsd
  3. Apr 16, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    Calculate concentrations of HOBr and OBr- (just from the neutralization reaction stoichiometry), plug these numbers in the Henderson-Hasselbalch equation.
     
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