Buffer capacity calculator

Approximate β ≈ 2.303 [HA][A⁻]/([HA]+[A⁻]) in mol/L per pH unit.

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Model / formula

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

[HA] (M)

[A⁻] (M)

Result

β ≈ 0.0576 mol/(L·pH) (approximate, near pK_a)

$$\beta \approx 2.303 \frac{[HA][A^-]}{[HA] + [A^-]}$$

Larger β resists pH change more strongly near the buffer center.

Educational use only. Double-check values for labs, homework, and exams.