When Phosphoric Acid (H₃PO₄)dissolves in Water,the Following Equilibrium Is Established

question 29

Multiple Choice

When phosphoric acid (H₃PO₄) dissolves in water,the following equilibrium is established: H₃PO₄ + H₂O H₃O⁺ + H₂PO₄^- If K_a = 7.5 × 10^-3 for H₃PO₄,which statement concerning an aqueous solution of phosphoric acid is correct?

• A)An aqueous solution of phosphoric acid contains mainly H₃PO₄ molecules.
• B)An aqueous solution of phosphoric acid contains predominantly H₃O⁺ and H₂PO₄^- ions.
• C)An aqueous solution of phosphoric acid contains equal amounts of H₃O⁺ and H₃PO₄.
• D)An aqueous solution of phosphoric acid contains a greater concentration of dissolved ions than it does neutral phosphoric acid molecules.

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