$A$ weak base is $5 \%$ dissociated in its $0.01 \ M$ solution. Calculate the dissociation constant.
- A$3.5 \times 10^{-6}$
- B$2.0 \times 10^{-5}$
- C$2.3 \times 10^{-4}$
- D$2.5 \times 10^{-5}$
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