Weak Acid Equilibrium
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Calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid.
HC2O4- = _____________________
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Solution Summary
This solution explains how to calculate the equilibrium concentration of the oxalate ion based on the concentration and Ka of oxalic acid.
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Polyprotic acids contain more than one dissociable proton. Each dissociation step has its own acid-dissociation constant, Ka1, Ka2, etc. For example, a diprotic acid H2A reacts as follows:
H2A(aq) + H2O(l) ↔H3O+(aq) +HA-(aq)
Ka1=[H3O+][A2-]
[H2A]
HA-(aq) +H2O(l) <-> H3O+(aq) +A2- (aq)
Ka2=[H3O+][A2-]
[HA-]
In general, Ka2=[A2-] for a solution ...
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