The acid-dissociation constants of phosphoric acid (H3PO4) are -3 Ka1 = 7.5 × 10 , -8 Ka2 = 6.2 × 10 , and -13 Ka3 = 4.2 × 10 at 25.0°C What is the molar concentration of phosphate ion in a 2.5 M aqueous solution of phosphoric acid?

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The acid-dissociation constants of phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) are -3 Ka1 = 7.5 × 10 , -8 Ka2 = 6.2 × 10 , and -13 Ka3 = 4.2 × 10 at 25.0°C What is the molar concentration of phosphate ion in a 2.5 M aqueous solution of phosphoric acid?