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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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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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