Determine the pH of a 0.461 M C₆H₅CO₂H M solution if the K_a of C₆H₅CO₂H is 6.5 × 10^-5. A) 2.26 B) 4.52 C) 11.74 D) 9.48 E) 5.48

Question

Quizplus · Accepted Answer

The pH of the solution can be calculated using the formula for the dissociation of a weak acid: pH = 1/2(pKa - log[HA]), where pKa = -log(Ka) and [HA] is the concentration of the acid. Given Ka = 6.5 × 10^-5, pKa = -log(6.5 × 10^-5) ≈ 4.187. Substituting the values: pH = 1/2(4.187 - log(0.461)) ≈ 2.26.

Determine the PH of a 0