Why are buffers weak acids and bases?
Buffer: Buffer is a type of solution which resist any change in pH of the solution even when a small amount of acid and bases are added to it.
Types of buffer:
The buffer solutions are mainly of two types:
Solution of single substance: The solution of a salt of weak acid and a weak acid acts as a buffer.
Example: Ammonium acetate
Solution of mixture:
Acidic buffer: The solution of a mixture of a weak acid and salt of that weak acid with a strong base acts as an acidic buffer.
Example: Acetic acid + Sodium acetate
Basic buffer: The solution of a mixture of a weak base and salt of that weak base with a strong acid acts as a basic buffer.
Example: Ammonium hydroxide + Ammonium chloride