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Molarity of species in solution for polybasic acid
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Topic: Molarity of species in solution for polybasic acid (Read 3921 times)
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Fzang
Regular Member
Posts: 91
Mole Snacks: +3/-1
Molarity of species in solution for polybasic acid
«
on:
December 07, 2010, 03:56:10 PM »
Calculate the molarity of all species in a 0.200 M H
2
SO
4
solution.
And I'm given the K
a
for HSO
4
-
, which is 1.20*10
-2
This wouldn't be a problem with a monobasic acid. Now I have a polybasic acid, so what do I do?
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Borek
Mr. pH
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Deity Member
Posts: 27888
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Re: Molarity of species in solution for polybasic acid
«
Reply #1 on:
December 07, 2010, 04:42:37 PM »
Assume first dissociation step went to completion. That just means you have some initial concentration of H
+
(before HSO
4
-
starts to dissociate).
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ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
titrations.info
Fzang
Regular Member
Posts: 91
Mole Snacks: +3/-1
Re: Molarity of species in solution for polybasic acid
«
Reply #2 on:
December 07, 2010, 04:50:02 PM »
So with an acid that dissociates completely, say 1 mole acid, I'd just act as if I started by having 1 mole protons and 1 mole conjugate base, in total?
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Borek
Mr. pH
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Re: Molarity of species in solution for polybasic acid
«
Reply #3 on:
December 08, 2010, 04:17:53 AM »
Yes. If the acid first dissociation step is strong enough.
http://www.chembuddy.com/?left=pH-calculation&right=pH-polyprotic-acid-base
http://www.chembuddy.com/?left=pH-calculation&right=pH-polyprotic-simplified
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ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
titrations.info
Fzang
Regular Member
Posts: 91
Mole Snacks: +3/-1
Re: Molarity of species in solution for polybasic acid
«
Reply #4 on:
December 08, 2010, 04:46:04 AM »
Thanks.
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Molarity of species in solution for polybasic acid