\textbf{214.} How many milliliters from a 36.5\% by mass hydrochloric acid solution, with density $1.2\,\text{g.mL}^{-1}$, must be added to 10 liters of water so that the chloride ion concentration becomes approximately $9.5\,\text{ppm}$?\\
$(d_{\text{solution}} = 1\,\text{g.mL}^{-1}$ and $H=1,\, Cl=35.5\,\text{g.mol}^{-1})$
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(1) $0.52$ \hfill (2) $1.08$ \hfill (3) $2.57$ \hfill (4) $5.2$
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