November 24, 2024, 08:17:40 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Buffer solution  (Read 2449 times)

0 Members and 1 Guest are viewing this topic.

Offline nicolodn

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Buffer solution
« on: October 01, 2010, 07:10:10 AM »
Calculate the pH of a buffer solution prepared by adding 0.379 mole of the sodium salt of a weak organic acid HA to 0.516 L of 0.992 M acid HA (with pKa = 4.96) and diluting to 1.00 L with water.

How?
Logged

Offline Mr Lead

  • Regular Member
  • ***
  • Posts: 9
  • Mole Snacks: +2/-0
  • Gender: Male
Re: Buffer solution
« Reply #1 on: October 01, 2010, 08:13:09 AM »
Calculate molar concentration of sodium salt after diluition (n/Vtot);
Calculate molar concentration of weak acid after diluition (n/Vtot);
Apply Henderson-Hasselbalch equation to calculate molar concentration of H3O+ ---> then pH

:)
 
Logged

Offline nicolodn

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Buffer solution
« Reply #2 on: October 01, 2010, 08:15:42 AM »
Quote from: Mr Lead on October 01, 2010, 08:13:09 AM
Calculate molar concentration of sodium salt after diluition (n/Vtot);
Calculate molar concentration of weak acid after diluition (n/Vtot);
Apply Henderson-Hasselbalch equation to calculate molar concentration of H3O+ ---> then pH

:)
 

I did that but I got 4.83 and it's not the right answer....
Could you show me using the numbers in it? if it isn't the right answer.
Thanks
Logged

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Buffer solution
« Reply #3 on: October 01, 2010, 10:35:16 AM »
You got a correct answer for these data.
Logged
AWK
Pages: [1]   Go Up
« previous next »
Sponsored Links