Answer:
37 mmol of acetate need to add to this solution.
Explanation:
Acetic acid is an weak acid. According to Henderson-Hasselbalch equation for a buffer consist of weak acid (acetic acid) and its conjugate base (acetate)-
[tex]pH=pK_{a}(acetic acid)+log[\frac{mmol of CH_{3}COO^{-}}{mmol of CH_{3}COOH }][/tex]
Here pH is 5.31, [tex]pK_{a}[/tex] (acetic acid) is 4.74 and number of mmol of acetic acid is 10 mmol.
Plug in all the values in the above equation:
[tex]5.31=4.74+log[\frac{mmol of CH_{3}COO^{-}}{10}][/tex]
or, mmol of [tex]CH_{3}COO^{-}[/tex] = 37
So 37 mmol of acetate need to add to this solution.
