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Buffer Capacity Calculator
Buffer capacity is a quantitative measure of the ability of a buffer to resist changes in pH. It is defined as
the moles of an acid or base that can be added to a buffer solution without causing a significant change
in its pH.
Buffer capacity depends on the concentration of the buffer components (the weak acid and its
conjugate base), as well as the pH of the solution. Buffer solutions have the greatest buffer capacity
when the pH of the solution equal to the pKa value of the weak acid (pH = pKa). Outside of this range,
the buffer may become less effective at resisting changes in pH, leading to greater fluctuations in the pH
of the solution.
Equation
Buffer Capacity
=
amount of an acid or base (mol/L)
Final pH
-Inital pH
Inputs
| Buffer Capacity: | |
| amount of an acid or base (mol/L): | |
| Final pH: | |
| Inital pH: |
Feedback
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References
This online resource may be cited as follows
MLA | "Quest Calculate™ Buffer Capacity Calculator." AAT Bioquest, Inc., 20 Sep. 2026, https://www.aatbio.com/tools/solve-equation-calculator/buffer-capacity. | |
APA | AAT Bioquest, Inc. (2026, September 20). Quest Calculate™ Buffer Capacity Calculator. AAT Bioquest. https://www.aatbio.com/tools/solve-equation-calculator/buffer-capacity. | |
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