<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa . Its pH changes very little when a small amount of strong acid or base is added to it . Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications . In nature, there are many systems that use buffering for pH regulation . For example, the bicarbonate buffering system is used to regulate the pH of blood . </P> <P> Buffer solutions achieve their resistance to pH change because of the presence of an equilibrium between the acid HA and its conjugate base A . </P>

What is the function of a buffer in chemistry