1. Not finding help here? Sign up for a free 30min 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!

Titration question 2 equivalence points. Am i right?

  1. Nov 20, 2009 #1
    Titration question 2!! equivalence points. Am i right?

    1. The problem statement, all variables and given/known data
    this is the originial question.
    A 0.149 g sample of a weak acid (HA) requires 16.80 mL of 0.110 M NaOH to completely reach the equivalence point. What is the Molar Mass of the acid?
    and i got 86.63 g/mol. I have already made sure that it is right.

    the question continues,
    If the pH of the weak acid in question 1 (above) is 4,34 after 8.40 ml of the NaOH was added, what is the Ka of the acid?

    2. Relevant equations

    i think i remember this. At the half equivalence point, PH=PKa

    3. The attempt at a solution

    since PH=Pka at half equivalence point, the PH=10-4.38
    giving me 4.17x10-5

    am i right? :)
     
  2. jcsd
  3. Nov 20, 2009 #2

    symbolipoint

    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    Re: Titration question 2!! equivalence points. Am i right?

    Your concept is correct. I did not examine your values, so just trust your concept and you may do your own rechecking of the values.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Titration question 2 equivalence points. Am i right?
Loading...