Acid-Base & Buffer Tools
Solve pH, pKa and buffer preparation problems with the Henderson–Hasselbalch equation.
A pH calculation rarely stands alone — you usually need the conjugate ratio that produces it. These tools cover weak-acid pH from pKa, the Henderson–Hasselbalch equation solved for pH, pKa or the base-to-acid ratio, buffer preparation from a target pH, and full titration curves for strong and weak acids with their buffer region and equivalence point.
pH Calculator
Calculate pH from [H⁺], or from pKa for weak acids and buffers (Henderson-Hasselbalch).
Open tool →Buffer Calculator
Design a buffer solution using the Henderson-Hasselbalch equation. Compute the [A⁻]/[HA] ratio, concentrations, moles, and masses.
Open tool →pKa / Henderson-Hasselbalch
Solve the Henderson-Hasselbalch equation for pH, pKa or the conjugate base/acid ratio.
Open tool →