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Buffer Solutions Calculator

Calculate Buffer pH and Capacity

Buffer Properties

Results

Enter buffer properties above to calculate pH and buffer capacity

About Buffer Solutions

Buffer solutions resist changes in pH when small amounts of acid or base are added. The Henderson-Hasselbalch equation relates pH to the ratio of conjugate base to acid.

Key Formulas:

  • pH = pKa + log₁₀([A-]/[HA])
  • Buffer Capacity ≈ 2.303 × Ctotal × ( [A-][HA] / ([A-] + [HA]) )

Units:

  • Concentration: mol/L (M), mM, μM, nM
  • Amount: mmol, μmol, mol

Applications:

  • Biological systems (blood, cells)
  • Laboratory and industrial processes
  • Pharmaceuticals and food chemistry