3. • A buffer is a solution that is used to resist pH
change with the addition of acid or base.
• COMPOSITION
Combination of weak Acid/Base with salt of its
conjugate strong Acid/Base.
4. NOTE
• Buffer doesnot keep the solution Neutral.
• it keep the solution according to desired PH.
• it has a range to the specific PH which is
called Buffer capacity
5. Types Of Buffer Solution
Solutions of a weak acid and its salt of conjugate base.
PH < 7
Example : Sodium citrate buffer
Solutions of a weak base and its salt of conjugate acid.
PH > 7
Example Ammonium buffer
Example :
Example :
6. • Produced by mixing weak acid and weak base
PH = 7
Phosphate buffer
Neutral Buffer :
Example:
9. Why weak Acid or Base is used in Buffer Solution
• Because weak acid or base dissociate into its ions very
slowly and the product containing H+/OH- does not
effect buffer solution.
CH3COOH (aq) CH3COO– (aq) + H+ (aq)
CH3COO– (aq) + H+ (aq) CH3COOH (aq)
10. why salt of strong Acid/Base is used.
• Because the strong Acid/Base is fully dissociated in
solution which will neutralize the negative part of
added Acid/Base.
11. Why conjugate salt is added
• Conjugate salt of given acid/base is added to decrease
the solubility
• Solubility decreases due to COMMON ION EFFECT.
• Thats why the acid and salt is not dissolved.
12.
13. • Why buffer solution is used...........
• Why weak acid is used ............
• Why acid and salt is not dissolved in buffer
solution........
• If strong acid is used what will happen to buffer
mechanism.............
• Why water is not used as a neutral buffer............
• Do buffer maintain a specific PH.........
• Example of Acidic buffer.............
• Example of Basic buffer..........
• Example of Neutral buffer.........
