A buffer solution is a solution that resists changes in pH even when a strong acid or base is added or when the solution is diluted with water. The buffer solution shows the capacity to limit the extent of pH changes in the presence of added acid or base.
The typical composition of a buffer solution includes a weak acid or base of a particular concentration and its conjugate base or acid of a particular concentration. Buffers act to maintain pH values at or near certain values. Buffer systems are vital to live organisms and in many laboratory procedures.