Buffer Capacity Calculator
Calculate the buffer capacity (beta) of a weak acid and conjugate base solution.
Calculation Parameters
Adjust the values below.
Calculated Result
Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve Buffer Capacity problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Buffer Concentration (M) (Range: 0.01 to 2.00, Default: 0.10)
- Solution pH (Range: 0 to 14, Default: 4.75)
- Weak Acid pKa (Range: 0 to 14, Default: 4.75)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
Where:
- Buffer Concentration: Parameter value.
- Solution pH: Parameter value.
- Weak Acid pKa: Parameter value.
Step-by-Step Calculation Example
To calculate Buffer Capacity manually, follow these steps:
- Identify the input parameters. For example:
- Buffer Concentration (M) = 0.10
- Solution pH = 4.75
- Weak Acid pKa = 4.75
- Apply the formula:
β = 2.303 * C_buffer * (Ka * [H+] / (Ka + [H+])²)
- Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is buffer capacity (β)? ▼
Buffer capacity is the moles of strong acid or base required to change the pH of 1 liter of buffer solution by 1.0 pH unit.
What is the Van Slyke equation for buffer capacity? ▼
β = 2.303 × C × (Ka × [H+] / (Ka + [H+])²), where C is total buffer concentration.
At what pH is buffer capacity maximized? ▼
Buffer capacity is maximum when pH = pKa, where weak acid and conjugate base concentrations are equal.