15 Determine the pH at the first equivalent point for the titration of a H₃PO₄ solution with NaOH.
(A)pH=pKₐ₁
(B)pH=pKₐ₂
(C)pH=pKₐ₃
(D)pH=(pKₐ₁+pKₐ₂)/2
(E)pH=(pKₐ₂+pKₐ₃)/2

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