What is the hydronium-ion concentration of a 0.210 M oxalic acid,H₂C₂O₄,solution? For oxalic acid,Ka₁ = 5.6 × 10^-2 and Ka₂ = 5.1 × 10^-5. A)8.4 × 10^-2 M B)1.1 × 10^-1 M C)1.0 × 10^-7 M D)3.2 × 10^-3 M E)3.3 × 10^-3 M

Question

Quizplus · Accepted Answer

Given the dissociation constants (Ka values) for oxalic acid and its concentration, the hydronium-ion concentration can be estimated using the first dissociation constant (Ka1 = 5.6 × 10^-2) because it is significantly larger than the second (Ka2 = 5.1 × 10^-5), indicating the first dissociation step contributes most to the hydronium-ion concentration. The correct answer is calculated based on the assumption that the concentration of hydronium ions primarily comes from the first dissociation step of oxalic acid.

What Is the Hydronium-Ion Concentration of a 0