Barium hydroxide, $$\(\mathrm{Ba}(\mathrm{OH})_{2}\)$$, is a strong base. A $$\(250.0 \mathrm{~cm}^{3}\)$$ solution of $$\(\mathrm{Ba}(\mathrm{OH})_{2}\)$$ with a pH of 12.2 is made by dissolving $$\(\mathrm{Ba}(\mathrm{OH})_{2}\)$$ in distilled water. Calculate the mass of $$\(\mathrm{Ba}(\mathrm{OH})_{2}\)$$ required to make this solution. Show your working. $$\(\left[M_{\mathrm{r}}: \mathrm{Ba}(\mathrm{OH})_{2}, 171.3\right]\)$$ mass of $$\(\mathrm{Ba}(\mathrm{OH})_{2}=\)$$ .......................... g

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