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Commercially available concentrated HCI ...

Commercially available concentrated HCI contains 38.0% HCl by mass (density = 1.19 `g mL^(-1) ` ). The molarity of the solution is

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`M = (% "by weight" xx 10 xx d)/(Mw_(2)) = (30 xx 10 xx 1.095)/(36.5) = 9 M`
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