Buffer solution : The solution whose pH remains unchanged when some amount of acid or base is added on it is known as buffer solution. Hence buffer resist the change in pH . This process is known as buffer mechanism. Buffer solution are of two types : (i) Mixed buffer and (ii) Simple buffer solution (i) Mixed buffer solution : It is of two types : (a) Acidic buffer (b) Basic buffer (a) Acidic buffer : A mixture formed by weak acid and when this weak acid react with strong base, is known as acidic buffer. Ex. : Mixture of $CH _3 COOH$ and $CH _3 COONa$. (b) Basic buffer : A mixture formed by weak base and reaction of weak base and strong acid is basic buffer. Ex. : Mixture of $NH _4 OH$ and $NH _4 Cl$. (ii) Simple buffer solution : Buffer formed by weak acid and weak base is simple buffer. Ex. : $CH _3 COONH _4$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.