December 27, 2024, 02:18:28 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: pH  (Read 6973 times)

0 Members and 1 Guest are viewing this topic.

Courtney

  • Guest
pH
« on: March 08, 2005, 12:43:25 PM »
What is the pH of 0.0180M ammonia?
Logged

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:pH
« Reply #1 on: March 08, 2005, 02:56:43 PM »
use Ka or Kb to solve for the pH for the corresponding equilibrium expression.
Logged
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:pH
« Reply #2 on: March 08, 2005, 07:34:33 PM »
Write a chemical equation. ;)
Logged
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27887
  • Mole Snacks: +1816/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re:pH
« Reply #3 on: March 09, 2005, 06:30:04 PM »
Quote from: Courtney on March 08, 2005, 12:43:25 PM
What is the pH of 0.0180M ammonia?

Regardless of what pH is, only 3.1% ammonia is in protonated form. BATE rulez  :)
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:pH
« Reply #4 on: March 10, 2005, 08:55:54 AM »
NH3 + H2O <-> NH4+ + OH-
Kb = [OH-][NH4+]/[NH3]
let x be change in NH3 concentration
[NH3] = 0.018 - x
[NH4+] = x
[OH-] = x

solve for x, then use pH + pOH = 14 to find the required pH
Logged
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

pizza1512

  • Guest
Re:pH
« Reply #5 on: March 10, 2005, 09:03:16 AM »
How do you work out the pH of anything in chemistry...
Logged

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:pH
« Reply #6 on: March 10, 2005, 09:40:47 AM »
i think the best mean is to use a pH meter to directly measure the pH, instead of us pressing numbers on our calculator. LOL
Logged
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:pH
« Reply #7 on: March 10, 2005, 09:29:10 PM »
Quote from: pizza1512 on March 10, 2005, 09:03:16 AM
How do you work out the pH of anything in chemistry...

On paper? Or in practice?
Logged
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27887
  • Mole Snacks: +1816/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re:pH
« Reply #8 on: March 12, 2005, 06:51:57 PM »
Quote from: pizza1512 on March 10, 2005, 09:03:16 AM
How do you work out the pH of anything in chemistry...

Me? I am using BATE  :)
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links