Chemistry

Problem

A 50.0 mL sample of 0.100 M phosphoric acid (H₃PO₄) is titrated with 0.200 M KOH. After 12.5 mL of KOH has been added, what is the pH of the solution? (Only the first dissociation of H₃PO₄ is significant; pKₐ₁ = 2.15.)

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