\textbf{231.} To the $\mathrm{pH} = 2$ solution of $0.01\,\mathrm{M}$ hydrochloric acid, how many grams of potassium hydroxide ($M = 56\,\mathrm{g\cdot mol^{-1}}$) must be added to approximately double the $\mathrm{pH}$?
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(1) $0/5$ \hfill (2) $0/55$ \hfill (3) $1/00$ \hfill (4) $1/11$
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