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Weak-Acid Buffer Capacity — result sheet
Estimate the buffer capacity of a monoprotic weak-acid system from total concentration, pKa, and pH.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Beta = ln(10) C Ka[H+] / (Ka + [H+])^2, where Ka = 10^(-pKa) and [H+] = 10^(-pH).
This weak-acid expression estimates how much strong base or acid is required per pH unit near the stated composition. Capacity is greatest near pH equal to pKa for a fixed total concentration, but real buffers can be affected by activity, temperature, ionic strength, and multiple equilibria.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Total buffer concentration — mol/L; minimum 1.0E-6; maximum 1000000
- pKa — minimum 0; maximum 14
- pH — minimum 0; maximum 14
Worked example
| Input | Value |
|---|---|
| Total buffer concentration | 0.1 |
| pKa | 4.76 |
| pH | 4.76 |
Estimated buffer capacity is about 0.05756 mol/L per pH unit.
Assumptions and limits
- The system is modeled as one monoprotic weak acid and its conjugate base.
- The entered total concentration is the sum of the acid and conjugate-base forms.
- The result is an idealized molar capacity per pH unit, not a clinical or process-control prescription.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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