A buffer is prepared by mixing 100.0 mL of 0.200 M acetic acid (HC₂H₃O₂) with 60.0 mL…
CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A buffer is prepared by mixing 100.0 mL of 0.200 M acetic acid (HC₂H₃O₂) with 60.0 mL of 0.100 M NaOH. The pKa of acetic acid at 25 °C is 4.74. After the buffer is formed, 5.0 mL of 0.100 M HCl is added with no change in temperature. What is the pH of the solution after the HCl addition?
(a) 4.74
(b) 5.16
(c) 4.32
(d) 4.22