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Buffer/Ph/titration problem

  • Thread starter gerry73191
  • Start date
  • #1
29
3

Homework Statement


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


Homework Equations



[H+] = ka(a/b)

-log[h+] = ph

ka*kb=kw


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
 

Answers and Replies

  • #2
Borek
Mentor
28,328
2,717
Calculate concentrations of HOBr and OBr- (just from the neutralization reaction stoichiometry), plug these numbers in the Henderson-Hasselbalch equation.
 

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