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Topic: Calculating pH  (Read 4696 times)

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Offline SamstaUK

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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?
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Offline Astrokel

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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
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Offline SamstaUK

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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?
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Offline Astrokel

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Re: Calculating pH
« Reply #3 on: July 25, 2009, 08:26:22 AM »
Concentrations at equilibrium
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Offline Borek

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Re: Calculating pH
« Reply #4 on: July 25, 2009, 11:03:05 AM »
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ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline SamstaUK

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Re: Calculating pH
« Reply #5 on: July 25, 2009, 11:05:19 AM »
0.33
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Offline Borek

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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.
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ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
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