Calculate the pH of a solution with a pKa of 3.0 and a conjugate base to conjugate acid ratio of 0.2 using the Henderson Hasselbalch equation.

• A. pH = 3.0 + log(0.2) = 3.3
• B. pH = 3.0 + log(0.2) = 2.5
• C. pH = 3.0 + log(0.2) = 3.5
• D. pH = 3.0 + log(0.2) = 2.7

Answer: (D)