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Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid. H2C2O4...

Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid.

H2C2O4 + H2O ↔ H3O+ + HC2O4-

Ka1= ?

HC2O4- + H2O ↔ H3O+ + C2O42-

Ka2 = ?

An aqueous solution that is 1.05 M H2C2O4 has pH = 0.67. The free oxalate ion concentration in this solution is [C2O42-] = 5.3 x 10-5 M. Determine Ka1 and Ka2 for oxalic acid.

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