Using the ICE chart method, what is the equilibrium expression for the dissociation of phosphoric acid before any strong base is added?

• A. [H₂PO₄^-][H₃O⁺]/[H₃PO₄]
• B. [H₃PO₄][H₂PO₄^-]/[H₃O⁺]
• C. [HPO₄^2-][OH^-]/[H₂PO₄^-]
• D. [H₃O⁺][HPO₄^2-]/[H₂PO₄^-]

Answer: (A)