Given the equilibrium reactions for a dibasic acid $ H_2X $: $$ H_2X(aq) \rightleftharpoons H^+(aq) + HX^-(aq) $$ $$ HX^-(aq) \rightleftharpoons H^+(aq) + X^{2-}(aq) $$ If \( K_{a1} = 1.0 \times 10^

Question

Given the equilibrium reactions for a dibasic acid $H_2X$ : $H_2X(aq) \rightleftharpoons H^+(aq) + HX^-(aq)$ $HX^-(aq) \rightleftharpoons H^+(aq) + X^{2-}(aq)$ If $K_{a1} = 1.0 \times 10^{-4}$ and $K_{a2} = 1.0 \times 10^{-8}$ , what is the overall equilibrium constant $K_{overall}$ for the reaction $H_2X(aq) \rightleftharpoons 2H^+(aq) + X^{2-}(aq)$ ?

A

$0 \times 10^{-12}$

B

$0 \times 10^{-8}$

C

$0 \times 10^{-4}$

D

$0 \times 10^{-6}$

Accepted Answer

0 	imes 10^{-12}

Answer

0 	imes 10^{-8}

Answer

0 	imes 10^{-4}

Answer

0 	imes 10^{-6}

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