weak acid-strong base titration curve?

Question

where can you tell which region the maximum buffering occurs? Also where on the curve does the ph only depend on the acetate acid (NaOH is being titrated into acetate acid)? and where does the pH only depnd on the excess strong bases added?

Answer 1

1. the pH is solely dependent on CH3COOH only at the very start. The curve rises, and then flattens out very quickly as soon as a buffer solution is established. For most of the time between the start and the equivqlence point, there is buffering action, but maximum buffering is half way to equivalence.

2. the pH depends only on NaOH after the equivalence point.