29.2% (w/w) HCl stock solution has a density of 1.25 g mL–1. The molecular weight of HCl is 36.5 g mol–1. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

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29.2% (w/w) HCl stock solution has a density of 1.25 g mL^–1. The molecular weight of HCl is 36.5 g mol^–1. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

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$V \times 1 .25 = \frac{29 .2}{100} = \frac{200}{1000} \times 0 .4 \times 36 .5$

V = 8 ml