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Calculating pH
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Topic: Calculating pH (Read 4695 times)
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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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Astrokel
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Re: Calculating pH
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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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SamstaUK
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Re: Calculating pH
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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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Astrokel
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Re: Calculating pH
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Reply #3 on:
July 25, 2009, 08:26:22 AM »
Concentrations at equilibrium
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Borek
Mr. pH
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Re: Calculating pH
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Reply #4 on:
July 25, 2009, 11:03:05 AM »
Quote from: SamstaUK on July 25, 2009, 08:23:29 AM
how you get numbers
Which numbers?
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ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
titrations.info
SamstaUK
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Re: Calculating pH
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Reply #5 on:
July 25, 2009, 11:05:19 AM »
0.33
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Borek
Mr. pH
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Re: Calculating pH
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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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