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Q.
Which of the following is a buffer?
AMUAMU 2002
Solution:
A solution with reserve acidity or basicity is known as buffer.
These are of two types
(i) Acidic buffer solution A mixture of weak acid and its salt with strong base.
Example : $CH _{3} COOH + CH _{3} COONa$.
(ii) Basic buffer solution $A$ mixture of weak base and its salt with strong acid.
Example $NH _{4} OH + NH _{4} Cl$
$NH _{4} OH + NH _{4} Cl$ is a basic buffer because it is a mixture of weak base and its salt with strong acid.
$NaOH + Na _{2} SO _{4}$ and $NaOH + CH _{3} COONa$ are not buffer because in these mixture strong base is present. $K _{2} SO _{4}+ H _{2} SO _{4}$ is not a buffer due to the presence of strong acid.