Phosphoric acid ($H_3PO_4$), a triprotic acid, has three $pK_a$ values: 2.14, 6.86, and 12.4. What molar ratio of $HPO_4^{2-}$ to $H_2PO_4^-$ in solution would produce a pH of 7.00? molar ratio =
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00. At pH 7.00, the pH is between the second and third pKa values (6.86 and 12.4), so the predominant species will be H2PO4^-. Show more…
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