Capacidade Tampão
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Buffer Capacity Calculator (β) determines how effectively a buffer solution can neutralize acids or bases. The formula β ≈ 2.3·C·(A·HA)/(A+HA) depends on the concentrations of the acid (HA) and its conjugate base (A). Higher buffer capacity occurs when these concentrations are balanced, maintaining pH stability in the solution.
This tool is essential in laboratories, pharmaceutical industries, and biochemical research where pH control is critical. Examples include enzyme reaction solutions, industrial processes requiring acid-base stability, and environmental studies of natural systems like blood or soils.
To use it correctly, ensure accurate measurements of A and HA concentrations. Buffer capacity peaks when A ≈ HA (1:1 ratio). Avoid extreme concentration values or uncontrolled temperatures, as β can vary significantly under such conditions.
Frequently asked questions
Why is buffer capacity highest when A and HA concentrations are similar?
When A ≈ HA, the solution is at the maximum efficiency point for neutralizing acids and bases, according to the Henderson-Hasselbalch equation. This ensures both species are available in sufficient quantities for buffering reactions.
What does the 2.3 factor represent in the formula?
The 2.3 factor is the natural logarithm of 10 (ln10 ≈ 2.3) and arises from the derivative of pH with respect to acid/base addition, adjusted for logarithmic scales.
When should buffer capacity be used instead of pH?
Use β to predict solution resistance to pH changes. pH indicates the current state, while β quantifies how much the solution will resist changes when acid or base is added.
How to handle very low β results?
Low β indicates poor buffering efficiency. Check A and HA concentrations or dilute/concentrate the solution to optimize the component ratio.