For Which of the Following Equilibria Does K_c Correspond to the Acid-Dissociation

question 139

Multiple Choice

For which of the following equilibria does K_c correspond to the acid-dissociation constant,K_a,of H₂PO₄^-?

• A)H₂PO₄^-(aq)+ H₃O⁺(aq) H₃PO₄(aq)+ H₂O(l)
• B)H₂PO₄^-(aq)+ H₂O(l) H₃PO₄(aq)+ OH^-(aq)
• C)H₂PO₄^-(aq)+ H₂O(l) H₃O⁺(aq)+ HPO₄^2-(aq)
• D)H₃PO₄(aq)+ H₂O(l) H₃O⁺(aq)+ H₂PO₄^-(aq)
• E)HPO₄^2-(aq)+ H₂O(l) H₂PO₄^-(aq)+ OH^-(aq)

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