A weak acid, \( \mathrm{HA} \), has a \( \mathrm{K}_{\mathrm{a}} \) of \( 1.00 \times 10^{-5} \)...

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A weak acid, \( \mathrm{HA} \), has a \( \mathrm{K}_{\mathrm{a}} \) of \( 1.00 \times 10^{-5} \). If \( 0.100 \) mole of this acid dissolved in one litre of water, the percentage of acid dissociated at equilbrium is closest to
(a) \( 1.00 \% \)
(b) \( 99.9 \% \)
(c) \( 0.100 \% \)
(d) \( 99.0 \% \)
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