Capacidade tampão
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
β = 2.303·C·Ka·[H⁺]/(Ka+[H⁺])²
About this calculator
The buffer capacity (β) calculator determines a solution's ability to resist pH changes when acids or bases are added. The formula β = 2.303·C·Ka·[H⁺]/(Ka+[H⁺])² uses the buffer concentration (C), acid dissociation constant (Ka), and hydrogen ion concentration ([H⁺]). This tool is vital for predicting buffer efficacy in labs, pharmaceutical industries, and biological research.
Use this calculator in experiments requiring pH stability, such as laboratory solution preparation, enzymatic reactions, or drug formulations. Buffer capacity is highest when the solution's pH is near the acid's pKa, ensuring balanced responses to acid/base additions.
Note: The formula assumes ideal conditions and ignores factors like temperature, pressure, or complex ionic interactions. Always validate results with experimental measurements, especially in extreme concentrations or non-ideal solutions.
Frequently asked questions
What is buffer capacity?
It measures a solution's ability to resist pH changes when acids or bases are added, calculated by β = 2.303·C·Ka·[H⁺]/(Ka+[H⁺])².
How does buffer concentration affect results?
Higher concentration (C) increases buffer capacity, as there are more particles to neutralize added acid or base.
Why is pH ideal near pKa?
Buffer capacity peaks when pH ≈ pKa because the acid/base conjugate ratio is balanced, maximizing neutralization.
When should this calculator not be used?
Avoid it for solutions with complex ionic interactions, extreme temperatures, or when the buffer is outside its effective range (pH = pKa ± 1).