MDCAT Chemistry MCQ #111

Phenol (C6H5OH) has a pKa of 10. What is the pH of 0.1 M phenol solution? (Assume [H+] ≈ √(Ka × C))

MDCAT Chemistry MCQ #111

  1. Question 1

    Q1. Phenol (C6H5OH) has a pKa of 10. What is the pH of 0.1 M phenol solution? (Assume [H+] ≈ √(Ka × C))

    • A) 5.0
    • B) 5.5
    • C) 6.0
    • D) 6.5

    Answer: 5.5

    Explanation: Ka = 10^(-10). [H+] = √(10^(-10) × 0.1) = 10^(-5.5). pH = 5.5. Option A uses Ka = 10^(-10) directly.