November 27, 2024, 06:43:54 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: mass of NaOH  (Read 7130 times)

0 Members and 1 Guest are viewing this topic.

Offline pandabear

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +0/-0
mass of NaOH
« on: March 07, 2009, 09:09:23 AM »
What amount of solid NaOH must be added to 1.0 L of a .14 M H2CO3 solution to produce a solution with H+ = 3.2 x 10-11?

*No significant volume change as result of the addition of the solid.

Does it matter that it is a diprotic acid? Should we set up an ICE table? I'm not sure where to start...
Logged

Offline Vidya

  • Full Member
  • ****
  • Posts: 839
  • Mole Snacks: +46/-62
  • Gender: Female
  • Online Chemistry and Organic Chemistry tutor
    • Online Chemistry Tutor
Re: mass of NaOH
« Reply #1 on: March 07, 2009, 09:22:46 AM »
I think you need to make ice table to know how much H+ ions are present there and how much out of it you want to neutralize .Calculate no of moles of NaOH required to neutralize it.
Yes take care it is diprotic.
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27862
  • Mole Snacks: +1813/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: mass of NaOH
« Reply #2 on: March 07, 2009, 11:52:36 AM »
No need for ICE table, this is a buffer question. Use Henderson-Hasselbalch equation.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Vidya

  • Full Member
  • ****
  • Posts: 839
  • Mole Snacks: +46/-62
  • Gender: Female
  • Online Chemistry and Organic Chemistry tutor
    • Online Chemistry Tutor
Re: mass of NaOH
« Reply #3 on: March 08, 2009, 09:13:11 AM »
In Buffer solution you are using a salt and its weak acid.Than ofcourse you can use Henderson-Hasselbalch equation.But I dont think concentration of salt is given to you.A strong base and weak acid is given.
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27862
  • Mole Snacks: +1813/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: mass of NaOH
« Reply #4 on: March 08, 2009, 09:26:33 AM »
Think what reactions take place when you add NaOH. Think what you will have in the solution once pH goes up to 10.5.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links