What Is the Second Stepwise Equilibrium Constant Expression for Phosphoric

question 129

Multiple Choice

What is the second stepwise equilibrium constant expression for phosphoric acid H₃PO₄?

• A)K_a2 = ([H₃O⁺][H₂PO₄^-])/([H₃PO₄])
• B)K_a2 = ([H₃O⁺]2[HPO₄^2-])/([H₃PO₄])
• C)K_a2 = ([H₃O⁺]3[PO₄^3-])/([H₃PO₄])
• D)K_a2 = ([H₃O⁺][HPO₄^2-])/([H₂PO₄^-])

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