Definition of Buffer Capacity
- Buffer Capacity (β): A quantitative measure of a buffer’s ability to resist pH changes.
- Mathematical Expression:
-
$\beta = \frac{\Delta B}{\Delta{pH}}$
- $\Delta \mathrm{pH}$
= amount (in moles per liter) of strong acid or base added. - $\Delta B$
= change in pH resulting from the addition.
Factors Affecting Buffer Capacities
- Concentration of Buffer Components: Higher concentrations provide greater capacities.
- Ratio of Acid to Base: Maximum capacity occurs when
- Total Buffer Concentration: The sum of the concentrations of the weak acid and its conjugate base.
Importance
- Stability: Ensures the pH remains within a narrow range during chemical reactions or storage.
- Biological Systems: Maintains physiological pH crucial for life processes.
Thank you for reading from Firsthope's notes, don't forget to check YouTube videos!
Advertisements
