Phosphoric Acid Is a Triprotic Acid in Water,ionizing in the Following

question 199

Multiple Choice

Phosphoric acid is a triprotic acid in water,ionizing in the following sequential steps: H₃PO₄ + H₂O $\leftrightarrows$ H₂PO₄^- + H₃O⁺ H₂PO₄^- + H₂O $\leftrightarrows$ HPO₄^2- + H₃O⁺ HPO₄^2- + H₂O $\leftrightarrows$ PO₄^3- + H₃O⁺
Which equilibrium is most important in determining the pH of a solution of sodium phosphate?

• A)HPO₄^2- + H₂O \(\leftrightarrows\)PO₄^3- + H₃O⁺
• B)H₃PO₄ + H₂O \(\leftrightarrows\)H₂PO₄^- + H₃O⁺
• C)PO₄^3- + H₂O \(\leftrightarrows\)HPO₄^2- + OH^-
• D)H₂PO₄^- + H₂O \(\leftrightarrows\)H₃PO₄ + OH^-
• E)2H₂O\(\leftrightarrows\)H₃O⁺ + OH^-

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