You Have 500

Multiple Choice

You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH₃COOH) and 0.20 M sodium acetate (CH₃COONa) . What will the pH of this solution be after the addition of 20.0 mL of 1.00 M HCl solution? [K_a = 1.8 × 10^-5]Hint: Adding HCl will change the amounts of both the acid and the base. Calculate the pH based on the new amounts.

A) 4.74
B) 5.07
C) 4.71
D) 4.56
E) 4.42