Acid Base Titration Question

Question

Why must I consider the amount (volume) of the titrant added to determine the pH at any given point along a titration?

Answer 1

The titrant is added specifically to neutralize the unknown. This, by definition means that it is changing the pH as it is added by volume. For example, you have an unknown acetic acid solution and you add some NaOH of known concentration as the titrant - this will increase the pH based on the volume of NaOH you add.