Chemistry

Problem

Oxalic acid (H₂C₂O₄, pKₐ₁ = 1.25, pKₐ₂ = 4.27) is titrated with 0.100 M NaOH. After 20.0 mL of NaOH has been added to 40.0 mL of 0.0500 M H₂C₂O₄, the first equivalence point is reached. Calculate the pH of the solution at this point.

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