Find $[OH^{-}]$ if a monoacidic base is $3 \%$ ionised in its $0.04 \ M$ solution.
- A$3.1 \times 10^{-2} \ mol \ L^{-1}$
- B$4.5 \times 10^{-3} \ mol \ L^{-1}$
- C$9.0 \times 10^{-2} \ mol \ L^{-1}$
- D$1.2 \times 10^{-3} \ mol \ L^{-1}$
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