An Acetic Acid-Sodium Acetate Buffer Is Prepared by Mixing 6

An acetic acid-sodium acetate buffer is prepared by mixing 6.00 g NaCH₃CO₂ with 4.00 mL of CH₃CO₂H (density = 1.042 g/mL) and diluting to 1.00 L.What is the pH of the resulting buffer? The K_a of acetic acid is 1.8 × 10−⁵.

A) 4.10
B) 4.77
C) 4.99
D) 5.19
E) 5.78