Final answer:
The pH at the equivalence point when titrating acetic acid with NaOH is 8.72. The pH at the equivalence point is higher than 7 because the sodium acetate formed from the reaction acts as a weak base and increases the pH of the solution
Step-by-step explanation:
The pH at the equivalence point when 25.0 mL of a 0.225 M solution of acetic acid (CH3COOH) is titrated with 0.100 M NaOH to its end point is 8.72.
This is because acetic acid is a weak acid and does not completely ionize in water. At the equivalence point, the moles of acetic acid and moles of NaOH are equal, resulting in the formation of sodium acetate and water.
The pH at the equivalence point is higher than 7 because the sodium acetate formed from the reaction acts as a weak base and increases the pH of the solution