basic

Buffer Capacity from a Conjugate Acid-Base Pair Calculator

β ≈ 2.303 · C_total · ([HA]·[A⁻]) / ([HA] + [A⁻])².

Estimate the buffer capacity β of a conjugate acid-base pair at the working pH from the analytical concentrations of HA and A⁻: β ≈ 2.303·C_total·([HA]·[A⁻])/([HA] + [A⁻])². Reports the maximum capacity reached when [HA] = [A⁻].

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mol/L
mol/L

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

β ≈ 2.303 · ([HA]+[A⁻]) · ([HA]·[A⁻]) / ([HA]+[A⁻])²

In depth

Estimate the buffer capacity β of a conjugate acid-base pair at the working pH from the analytical concentrations of HA and A⁻: β ≈ 2.303·C_total·([HA]·[A⁻])/([HA] + [A⁻])². Reports the maximum capacity reached when [HA] = [A⁻].