$A$ weak base is $1.42 \%$ dissociated in its $0.05 \ M$ solution. Calculate its dissociation constant.

  • A
    $5.5 \times 10^{-5}$
  • B
    $4.0 \times 10^{-5}$
  • C
    $1.8 \times 10^{-5}$
  • D
    $1.0 \times 10^{-5}$

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