Question

define buffer action mention the criteria for selection of buffer system​

Answer 1

Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. For example, blood in the human body is a buffer solution. Buffer solutions are resistant to pH change because of the presence of an equilibrium between the acid (HA) and its conjugate base (A–).

Answer 2

its is the solution of weak acid and weak base so increse or decrese in concentration doesnot able to change th pH value of the solution