Question

A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is :
(Atomic mass : Cl = 35.5 amu, H = 1 amu)

• A. 10.2 M
• B. 12.5 M
• C. 14.0 M
• D. 18.2 M

Answer 1

Answer: (C)

14.0 M

Answer 2

Molarity =$\frac{35}{\frac{36.5 \times 100}{1.46}} \times 1000 = 14.0$M