A weak acid $HA$ has a $K_a$ of $1.00 \times 10^{-5} $. If $0.100\,mol$ of this acid is dissolved in one litre of water the percentage of acid dissociated at equilibrium is closest to.....$\%$

  • A

    $0.100$

  • B

    $99$

  • C

    $1$

  • D

    $99.9$

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