A buffer solution is prepared by mixing 10 mL of 1.0 M acetic and 20 mL of 0.5 M sodium acetate and then diluted to 100 mL with distilled water. If the pKa of CH3COOH is 4.76, what is the pH of the buffer solution prepared?
(a) 5.21
(b) 4.76
(c) 4.34
(d) 5.21
