# What is a buffer in chemistry?

Oct 11, 2016

A buffer solution is defined as a a solution that resist the change on its pH.

#### Explanation:

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 $C {H}_{3} C O O H$ and sodium acetate $N a C {H}_{3} C O O$.

Note that, when an acid is added to the solution, it will react with $N a C {H}_{3} C O O$, however, if a base is added to the solution it will react with $C {H}_{3} C O O H$. In both cases, the change on the pH will be very small.

Here is a video that fully explains this topic:
Acid - Base Equilibria | Buffer Solution.