which-of-the-following-correctly-describes-the-equilibrium-expression-for-the-fi

Question

Which of the following correctly describes the equilibrium expression for the first dissociation of a diprotic acid ($$H_{2}A$$)?

Accepted Answer

K_{a1} = [$$HA^{-}$$][$$H_{3}$O^{+}$$]/[$$H_{2}A$$]

Answer

K_{a1} = [$$A^{2-}$$][$$H_{3}$O^{+}$$]/[$$HA^{-}$$]

Answer

K_{a1} = [$$H_{2}A$$][$$H_{3}$O^{+}$$]/[$$HA^{-}$$]

Answer

K_{a1} = [$$H_{2}A$$][$$OH^{-}$$]/[$$HA^{-}$$]

Which of the following correctly describes the equilibrium expression for the first dissociation of a diprotic acid (H2A)?