What is a buffer in chemistry?
A buffer solution is defined as a a solution that resist the change on its pH.
It is usually prepared from a weak acid and the salt of its conjugate base or a weak base and the salt of its conjugate acid.
An example of a buffer solution is a solution made from acetic acid
Note that, when an acid is added to the solution, it will react with
Here is a video that fully explains this topic:
Acid - Base Equilibria | Buffer Solution.