\textbf{232.} Approximately how many grams of the weak base $\mathrm{BOH(s)}$ ($M = 80\,\mathrm{g\cdot mol^{-1}}$) with $2\%$ degree of dissociation must be added to $250\,\mathrm{mL}$ of water to obtain a solution with $\mathrm{pH} = 11$?
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(1) $1$ \hfill (2) $2$ \hfill (3) $4$ \hfill (4) $8$
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