November 22, 2024, 03:31:34 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Buffer solution  (Read 3431 times)

0 Members and 1 Guest are viewing this topic.

Offline angst

  • Regular Member
  • ***
  • Posts: 14
  • Mole Snacks: +0/-0
Buffer solution
« on: July 25, 2007, 10:27:28 PM »
Hi, I have a question about buffer solution NH4Cl+NH4OH. Can I know what is the ratio of this buffer solution?

What is the method to determine the ratio?

May I know the pH value of this buffer solution?

Thanks.
Logged

Offline enahs

  • 16-92-15-68 32-7-53-92-16
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 2179
  • Mole Snacks: +206/-44
  • Gender: Male
Re: Buffer solution
« Reply #1 on: July 25, 2007, 10:33:19 PM »
The pH depends on the ratio. The ratio depend on the pH. However you want to look at it.

The ratio and there for the pH depends on how much of the acid and conjugate base you have.


http://en.wikipedia.org/wiki/Henderson-Hasselbalch_equation
Logged

Offline sdekivit

  • Chemist
  • Full Member
  • *
  • Posts: 403
  • Mole Snacks: +32/-3
  • Gender: Male
  • B.Sc Biomedical Sciences, Utrecht University
Re: Buffer solution
« Reply #2 on: July 26, 2007, 04:37:34 AM »
in any case, when [acid] = [conjugated base] then pH of the buffer equals pKa and the solution will have buffer capacity in the range (pKa - 1) to (pKa + 1)
Logged

Offline profmsg

  • Regular Member
  • ***
  • Posts: 68
  • Mole Snacks: +3/-12
Re: Buffer solution
« Reply #3 on: July 28, 2007, 06:19:56 AM »
your buffer is made up of  NH4Cl+NH4OH and i agree with  sdekivit if no Ph is altered.

but must of the buffers are made in certain ratio with certain solvent then adjusted ph using  other chemical such as orthophosphoric acid.
so with the ratio of sovents, it is not possible to determine the ph of that buffer

Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links