Question

If the stoichiometric concentrations of Ac- and HAc in Solution C were known to be 0.08791 M and 0.02420 M, respectively after mixing, then calculate the theoretical pH of Solution C after mixing. Use the literature value for the pKa of acetic acid, which is 4.77

Answer 1

The theoretical pH of Solution C with known concentrations of acetate ion and acetic acid can be calculated using the Henderson-Hasselbalch equation. Given the pKa of acetic acid (4.77), the calculated pH is 5.33.

Step-by-step explanation:

To calculate the theoretical pH of Solution C containing 0.08791 M Ac- (acetate ion) and 0.02420 M HAc (acetic acid), we use the Henderson-Hasselbalch equation:

pH = pKa + log([Ac-]/[HAc])

Given the pKa value for acetic acid is 4.77, the calculation becomes:

pH = 4.77 + log(0.08791/0.02420)

After solving, the pH value is determined to be:

pH = 4.77 + log(3.63)

pH = 4.77 + 0.56

pH = 5.33

This is the theoretical pH of Solution C after mixing.