Which of the Following Acids Should Be Used to Prepare

Multiple Choice

Which of the following acids should be used to prepare a buffer with a pH of 4.5?

A) HOC₆H₄OCOOH, K_a = 1.0 *10¯³
B) C₆H₄(COOH) ₂, K_a = 2.9 *0 10¯⁴
C) CH₃COOH, K_a = 1.8 * 10¯⁵
D) C₅H₅O₅COOH, K_a = 4.0 * 10¯⁶
E) HBrO, K_a = 2.3 * 10¯⁹