Find the pH of a 0.20 M aqueous solution of dichloroacetic acid,for which K_a = 3.32 × 10^-².

Question

Quizplus · Accepted Answer

The pH of a weak acid solution can be calculated using the formula: pH = -log[H⁺], where [H⁺] is the concentration of hydrogen ions. For dichloroacetic acid, we use the formula [H⁺] = √(Ka × C), where C is the concentration of the acid. Substituting the given values, [H⁺] = √(3.32 × 10⁻² × 0.20) = √(6.64 × 10⁻³) ≈ 0.0814. Therefore, pH = -log(0.0814) ≈ 1.18.

Find the PH of a 0