Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Working out the ph of CH3COONa

  1. May 17, 2005 #1
    Hi ppl. I have a question. I'm given the pka of ethanoic acid/ethanoate ions at 4.75 and i have to work out the ph of a 5*10^-2 moldm3 solution of sodium ethanoate. I worked it out by getting the Ka from 10^-4.75 and then saying that the concentration of Ch3COO- in the dissociation of ethanoic acid is also 5*10^-2 moldm3. Then i used the equation for the Ka to get the corresponding concentration of H+ ions in this dissociation and hence the ph, is this method of reasoning correct? Thanks, Joe
  2. jcsd
  3. May 17, 2005 #2


    User Avatar

    Staff: Mentor

  4. May 17, 2005 #3


    User Avatar
    Science Advisor
    Homework Helper

    The question itself seems to indicate an initial concentration of ethanoate, however, your discussion implies ethanoic acid? Please be more clear...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook