How to use the buffer capacity calculator
Find how strongly a buffer resists pH change, the buffer capacity beta. Enter buffer concentration, acid dissociation constant, buffer ph in the fields above; the buffer capacity β is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “buffer capacity”, “how well does buffer resist pH change”, “beta buffer index”, “calculate buffer capacity”, “find buffer capacity β”.
Formula
Variables
- C — Buffer concentration (M)
- Ka — Acid dissociation constant
- pH — Buffer pH
Worked example
With buffer concentration = 0.1 M, acid dissociation constant = 1.8e-5, buffer ph = 4.74, the calculator gives buffer capacity β ≈ 0.05757329 mol/(L·pH).
Frequently asked questions
What is the buffer capacity calculator used for?
Find how strongly a buffer resists pH change, the buffer capacity beta. It helps with questions such as “buffer capacity”, “how well does buffer resist pH change”, “beta buffer index”.
What is the formula for the buffer capacity calculation?
Buffer capacity β (mol/(L·pH)) = 2.303 × C × Ka × (10^(-pH)) / ((Ka+10^(-pH))^2). Here C is buffer concentration (M), Ka is acid dissociation constant, pH is buffer ph.
What inputs do I need for the buffer capacity calculator?
You need buffer concentration in M, acid dissociation constant, buffer ph. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the buffer capacity calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the buffer capacity result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.