Both benzoic acid and the sodium salt of its conjugate base, sodium benzoate, are

common preservatives in foods.

A food producer wishes to transition from the

manufacture of 10-2 M stock solutions of benzoic acid to 10-2 M stock solutions of sodium

benzoate by adding NaOH. Estimate the pH of the mixture at the beginning, middle, and

end of the transition? The pKa = 4.2. Draw the pC-pH diagram labeling all constituents

and the pH vs f titration curve sufficiently to cover the entire pH range to answer this

question. (30 points total)