Question

A buffer solution is prepared by mixing 0.1 mol of acetic acid (\( \mathrm{p}K_a = 4.74 \)) and 0.2 mol of sodium acetate in 1 L solution. What is the pH of the buffer?

• A. 4.44
• B. 5.04
• C. 4.74
• D. 5.74

Hint:

\textbf{Tip:} For weak acid–salt buffers, use the Henderson-Hasselbalch equation and remember \( \log 2 \approx 0.30 \).