You Wish to Prepare an HC₂H₃O₂ Buffer with a PH

Multiple Choice

You wish to prepare an HC₂H₃O₂ buffer with a pH of 4.14.If the pK_a of is 4.74,what ratio of C₂H₃O₂⁻/HC₂H₃O₂ must you use?

A) 0.10
B) 0.60
C) 0.25
D) 3.98
E) 4.0