Question

Suppose 0.035 moles of HCl is dissolved in enough water to produce 750 mL of solution. What is the pH

Answer 1

Answer:

pH = 1.33

Explanation:

Because HCl is a strong acid, each mole of HCl will completely dissociate into H⁺ and Cl⁻ species.

Now we calculate the molar concentration (molarity) of H⁺:

• Molarity = moles / volume

(750 mL ⇒ 750 / 1000 = 0.750 L)

• Molarity = 0.035 moles / 0.750 L

• Molarity = 0.0467 M

Then we calculate the pH of the solution:

• pH = -log [H⁺]

• pH = -log (0.0467 M)

• pH = 1.33