Phosphoric acid has the following dissociation constants: , ,

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Phosphoric acid has the following dissociation constants: pKa1=2.15pK_{a1}=2.15, pKa2=7.20pK_{a2}=7.20, pKa3=12.35pK_{a3}=12.35. Identify the predominant ionic species of phosphoric acid present in a solution at pH=9.0pH = 9.0 (choose from H3PO4\mathrm{H_3PO_4}, H2PO4−\mathrm{H_2PO_4^-}, HPO42−\mathrm{HPO_4^{2-}}, or PO43−\mathrm{PO_4^{3-}}).

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