Commercial grade HCl solutions usually have a concentration of 31.0% by mass HCl in water. If the solution has a density of 1.20 g/mL, calculate the molarity of the HCl solution.

• A. 31.0 M
• B. 8.50 M
• C. 10.2 M
• D. 7.08 M
• E. 14.8 M

Answer: (C)