Question

Concentrated hydrochloric acid is 38% HCl by weight and has a density of 1.19 g/mL. A solution is prepared by measuring 70 mL of the concentrated HCl, adding it to water, and diluting to 0.500 L. Calculate the approximate molarity of this solution from the volume, percent composition, and density.

Answer 1

First determine the molarity of the concentrated HCl.
That's
1.19 g/mL x 1000 mL x (38/100) x (1 mol/36.5 g) = ?M HCl

Then use the dilution formula of
mL1 x M1 = mL2 x M2

Answer 2

1.734mol/l=M