The pH of a buffer solution only changes slightly with the addition of a base or acid.
Buffer
A buffer is a solution that has a certain level of resistance to pH change when an acid or a base is added to it.
Thus, when an acid or a base is added to a buffer solution, the pH only changes slightly because a neutralization reaction is not allowed to take place.
Buffer solutions are prepared by mixing a large volume of a weak base or acid with their respective conjugate acid or base.
More on buffer solutions can be found here: https://brainly.com/question/1613474
