Acetic acid has a Ka of 1.8*10^-5. Three acetic acid/ acetate buffer solutions, A, B, and C, wer made using varying concentrations: 1. [acetic acid] ten times greater than [acetate] 2. [acetate] ten times greater than [acetic acid] 3. [acetate] = [acetic acid] Match each buffer to the expected pH pH = 3.74 pH= 4.74 pH = 5.74

Explanation:

It is given that for acetic acid is . And, its value will be calculated as follows.

                        =

                        = 4.74

And, according to the Henderson-Hasselbalch equation,

             pH =

(1).   When [Acetic acid] is ten times greater than [acetate]

This means that

So,   pH =

             =

             = 3.74

(2). When [Acetate] ten times greater than [Acetic acid]

This means that =

             pH =

                   = 5.74

(3).  When [acetate] = [acetic acid]

This means that = 1

            pH =

                  = 4.74