Weak Acid Equilibrium

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

HC2O4- = _____________________

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...f a weak diprotic acid because [H3O+]≈[HA-]

Many household cleaning products contain oxalic acid, H2C2H4, a diprotic acid with the following dissociation constants: Ka1 =5.9*10-2 and Ka2 =6.4*10-5 .

Calculate the equilibrium concentration of H3O+ in a 0.20 M solution of oxalic acid -
H3O+ = 0.083 M

Calculate the equilibrium concentration of C2O42- in a 0.20 M solution of oxalic acid ----
C2O42- = ...