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Topic: pH  (Read 6775 times)

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Courtney

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pH
« on: March 08, 2005, 12:43:25 PM »
What is the pH of 0.0180M ammonia?
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Offline Donaldson Tan

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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.
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Offline Mitch

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Re:pH
« Reply #2 on: March 08, 2005, 07:34:33 PM »
Write a chemical equation. ;)
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Offline Borek

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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  :)
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Offline Donaldson Tan

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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
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pizza1512

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

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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?
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Offline Borek

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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  :)
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