4 - Lewis acid. You titrate 100. The Bz - ion is basic. Therefore, the final solution is basic. Buffer Solutions Buffers resist changes in the pH of a solution.
Buffers are a special case of the common ion effect.
The pH of a buffer is determined by the pK a of the acid and then adjusted by the ratio of acid and conjugate base. Acid-Base Titrations Adding NaOH from the buret to acetic acid in the flask, a weak acid. At first the pH increases very slowly. Additional NaOH is added. More NaOH is added.