Question
What is buffer solution? It is of how many types?
✓
Answer
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. : $CH _3 COONH _4$.
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. : $CH _3 COONH _4$.
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