Calculate the expected pH values when 80.00 mL of benzoic acid-sodium benzoate buffer (0.600 M, pH 4.20) is added

with 5.00 mL of 0.100 M NaOH. The Ka of 6.30x10-5

. Show the calculation for the theoretical pH after NaOH addition to

the given buffer and the pH change. Is it a good buffer? Yes or No and Why?​