Buffer solutions are commonly used in biological laboratories to resist change in pH upon addition of an acid or base to a solution. Buffers are incorporated into reagents so thatthe desired pH may be maintained. The buffer solution consists of a weak acid and its conjugate base, or vice versa. Such buffers are naturally found in the body as blood pH regulators, or buffers to maintain pH for enzyme activities. Common biological buffers are tris, HEPES, MOPS buffer etc.