82 -- Considering the given reaction, if 250 milliliters of $\text{Ba(OH)}_2$ solution with a concentration of 21375 ppm is present, how many milliliters of 0.4 molar $\text{HCl}$ solution are needed for the complete reaction with it? (Assume the density of the solution equals the density of water; $\text{H}{\blacksquare}1$, $\text{O}{\blacksquare}16$, $\text{Ba}{\blacksquare}137$ : $\text{g.mol}^{-1}$) $$\text{Ba(OH)}_2(aq) + \text{HCl}(aq) \longrightarrow \text{BaCl}_2(aq) + \text{H}_2\text{O}(l)$$ (1) $37.5$ (2) $62.5$ (3) $75$ (4) $125$
\textbf{82 --} Considering the given reaction, if \textbf{250} milliliters of $\text{Ba(OH)}_2$ solution with a concentration of \textbf{21375 ppm} is present, how many milliliters of \textbf{0.4} molar $\text{HCl}$ solution are needed for the complete reaction with it? (Assume the density of the solution equals the density of water; $\text{H}{\blacksquare}1$, $\text{O}{\blacksquare}16$, $\text{Ba}{\blacksquare}137$ : $\text{g.mol}^{-1}$)
$$\text{Ba(OH)}_2(aq) + \text{HCl}(aq) \longrightarrow \text{BaCl}_2(aq) + \text{H}_2\text{O}(l)$$
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(1) $37.5$ \hspace{2cm} (2) $62.5$ \hspace{2cm} (3) $75$ \hspace{2cm} (4) $125$
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