The conductivity of $0.001 \ M$ acetic acid at a certain temperature is $5.07 \times 10^{-5} \ S \ cm^{-1}$. If $\wedge_m^0$ of acetic acid at the same temperature is $390 \ S \ cm^2 \ mol^{-1}$,the dissociation constant of acetic acid at that temperature is:

  • A
    $1.94 \times 10^{-5}$
  • B
    $1.94 \times 10^{-3}$
  • C
    $1.94 \times 10^{-4}$
  • D
    $1.94 \times 10^{-6}$

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