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Calcimator

Buffer Solution Calculator

Calculate buffer pH using the Henderson-Hasselbalch equation. Enter pKa, acid concentration, and conjugate base concentration.

Inputs

M
M

Results

Buffer pH

4.76

[A⁻]/[HA] Ratio1
Buffer Capacity (β)0.11515
Effective Range (Low)3.76
Effective Range (High)5.76
Ka1.7378e-5
How to Use This Calculator
  1. Enter the pKa of the weak acid in your buffer system.
  2. Set acid concentration [HA] and conjugate base concentration [A⁻] in mol/L.
  3. Review Buffer pH (from Henderson-Hasselbalch), [A⁻]/[HA] Ratio, Buffer Capacity (β), and Effective pH Range.
  4. For maximum buffer capacity, choose a weak acid with pKa within 1 pH unit of your target pH.
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Formula

pH = pKa + log₁₀([A⁻]/[HA])

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