For the ionization of a weak acid $HA$ as $HA \rightleftharpoons H^{+} + A^{-}$,the $pH$ of a $1.0 \ M$ solution is $5$. The dissociation constant $K_a$ is:
- A$10^{-10}$
- B$5$
- C$5 \times 10^{-8}$
- D$1 \times 10^{-5}$
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