How to use (3 steps)
- Choose a mode: single solution or strong acid–strong base mixture.
- Enter concentrations (and volumes for mixtures). For weak species, choose Ka/pKa or Kb/pKb.
- Compute to see pH, pOH, key concentrations, and the calculation steps. Copy the URL to share.
The default example loads automatically so you can see pH right away. All calculations run in your browser only.
Results
pH
—
—
pOH
—
Single solution mode
Single solution
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Solution details
| pH | — |
|---|---|
| pOH | — |
| [H⁺] (mol/L) | — |
| [OH⁻] (mol/L) | — |
| α (dissociation) | — |
Mixture details
| Initial moles acid n_a | — |
|---|---|
| Initial moles base n_b | — |
| [H⁺] (mol/L) | — |
| [OH⁻] (mol/L) | — |
| pH | — |
| pOH | — |
| Excess side | — |
How it is calculated
- Steps will appear here after calculation.
FAQ
Can this handle weak acids and bases?
Yes. Enter the concentration and Ka (or pKa) for a weak acid, or Kb (or pKb) for a weak base. The calculator solves the quadratic exactly instead of using small-x approximations.
What assumptions does this calculator make?
It assumes monoprotic acids and monobasic bases at about 25 °C, ignores activity coefficients, and uses Kw = 1.0×10⁻¹⁴. Extremely dilute solutions may deviate from these ideal assumptions.
What can I compute in the strong acid–strong base mixing mode?
Enter the concentration and volume of the acid and base. The tool computes initial moles, determines which side is in excess, and returns [H+], [OH-], pH, and pOH. At equivalence it reports pH ≈ 7.
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