The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO)is 3.0 × 10^-⁸. At equilibrium, the molarity of H₃O⁺ in a 0.066 M solution of HClO is ________.

Question

Quizplus · Accepted Answer

The equilibrium concentration of H₃O⁺ can be found using the formula for the acid-dissociation constant: Ka = [H₃O⁺][ClO⁻]/[HClO]. Assuming x is the concentration of H₃O⁺ at equilibrium, Ka = x²/(0.066 - x). Solving for x using Ka = 3.0 × 10⁻⁸ gives x ≈ 4.4 × 10⁻⁵ M.

The Acid-Dissociation Constant at 25