1. Assume a Basis

* Assume you have 100 g of the solution. This makes the calculations easier.

2. Calculate the Mass of HCl

* Since the solution is 18.25% HCl by mass, you have 18.25 g of HCl in 100 g of solution.

3. Calculate the Volume of the Solution

* Use the density to find the volume:

* Volume = Mass / Density

* Volume = 100 g / 1.2 g/mL = 83.33 mL

4. Convert Volume to Liters

* 83.33 mL = 0.08333 L

5. Calculate Moles of HCl

* Molar mass of HCl = 36.46 g/mol

* Moles of HCl = Mass of HCl / Molar mass of HCl

* Moles of HCl = 18.25 g / 36.46 g/mol = 0.500 mol

6. Calculate Molarity

* Molarity (M) = Moles of solute / Volume of solution (in liters)

* Molarity = 0.500 mol / 0.08333 L = 6.00 M

Therefore, the molarity of the hydrochloric acid solution is 6.00 M.