Problem: Many household cleaning products contain oxalic acid, H2C2O4, a diprotic acid with the following dissociation constants: Ka1 = 5.9x10-2, Ka2 = 6.4x10-5Calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid.

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We’re being asked to calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid. Oxalic acid is a diprotic acid, it can donate two protons (H+and it will have two equilibrium reactions

Given:

Ka1 = 5.9x10-2

1st equilibrium reaction:                H2C2O4(aq) + H2O(l) → HC2O4­-(aq) + H3O+(aq)

Ka2 = 6.4x10-5

2nd equilibrium reaction:               HC2O4­-(aq) + H2O(l) → C2O4­­-(aq)H3O+(aq)

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Problem Details

Many household cleaning products contain oxalic acid, H2C2O4, a diprotic acid with the following dissociation constants: Ka1 = 5.9x10-2, Ka2 = 6.4x10-5

Calculate the equilibrium concentration of HC2O4- in a 0.20 M solution of oxalic acid.

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