Consider a Reaction That Produces a Significant Amount of Hydrogen

Multiple Choice

Consider a reaction that produces a significant amount of hydrogen ion and is to be carried out a pH 7. Only two acids are available for making the buffer solution. The pK_a values for acids A and B are 6.3 and 7.3, respectively. Which acid would serve as the optimum buffer for this reaction? Or would carrying out the reaction in water simply serve as well?

A) acid A
B) acid B
C) water
D) both acids would be equally effective