Question

Hydrochloric acid is 38% by mass. If the density of solution is 1.19 gm cm³, then what will be the molarity of solution?

Answer 1

38% by mass = 38 g HCl in 100 g solution
38 g HCl in 100/1.19 mL = 84 mL solution = 0.084 L .
Molarity = \(\frac{38}{36.5}\) × \(\frac{1}{0.084}\) = 12.39 M.
Thus, the molarity of solution is 12.39 M.