April 29, 2024, 08:32:21 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Calculating pH  (Read 4499 times)

0 Members and 1 Guest are viewing this topic.

Offline SamstaUK

  • New Member
  • **
  • Posts: 8
  • Mole Snacks: +0/-0
Calculating pH
« on: July 24, 2009, 10:49:04 PM »
Maybe this is too advanced for High School chemistry, but I'm curious.. How do you calculate the pH of a solution?

I saw the formula -log[H+]

What is H+?

Could someone show me a couple of examples, first with HCl, then with H2SO4?

What about H2O?
Logged

Offline Astrokel

  • Full Member
  • ****
  • Posts: 989
  • Mole Snacks: +65/-10
  • Gender: Male
Re: Calculating pH
« Reply #1 on: July 24, 2009, 11:15:30 PM »
Hey, check this out by one of our forum's adminstrator, Borek.

http://www.chembuddy.com/?left=pH-calculation&right=toc
Logged
No matters what results are waiting for us, it's nothing but the DESTINY!!!!!!!!!!!!

Offline SamstaUK

  • New Member
  • **
  • Posts: 8
  • Mole Snacks: +0/-0
Re: Calculating pH
« Reply #2 on: July 25, 2009, 08:23:29 AM »
Okay one thing I'm not understanding is where the equilibrium numbers from from.

eg: [NO2]2
     -------- = 0.33
     [N2O4]

I have no idea how you get numbers from the letters? Is it based on RMM or something?
Logged

Offline Astrokel

  • Full Member
  • ****
  • Posts: 989
  • Mole Snacks: +65/-10
  • Gender: Male
Re: Calculating pH
« Reply #3 on: July 25, 2009, 08:26:22 AM »
Concentrations at equilibrium
Logged
No matters what results are waiting for us, it's nothing but the DESTINY!!!!!!!!!!!!

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27665
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Calculating pH
« Reply #4 on: July 25, 2009, 11:03:05 AM »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline SamstaUK

  • New Member
  • **
  • Posts: 8
  • Mole Snacks: +0/-0
Re: Calculating pH
« Reply #5 on: July 25, 2009, 11:05:19 AM »
0.33
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27665
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Calculating pH
« Reply #6 on: July 25, 2009, 11:47:03 AM »
This is equilibrium constant, in most cases these are measured experimentally and listed in tables.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links