The dissociation constant of a monoacidic weak base $MOH$ is $1.8 \times 10^{-5}$. What is the concentration of $OH^{-}$ ions in its $0.1 \, M$ solution?
- A$1.8 \times 10^{-5}$
- B$1.34 \times 10^{-3}$
- C$5 \times 10^{-5}$
- D$4.0 \times 10^{-3}$
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