$A$ 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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