You Wish to Prepare a Buffer Containing CH₃COOH with a PH

Multiple Choice

You wish to prepare a buffer containing CH₃COOH with a pH of 4.24. If the pK_a of acetic acid is 4.74, what ratio of [CH₃COO⁻]/[CH₃COOH] must you use?

A) 0.10
B) 0.50
C) 0.32
D) 2.0
E) 2.8