What this calculates
This page estimates pH and pOH from the analytical concentration of a strong monoprotic acid or monobasic base. It keeps the concentration in mol/L, applies the ideal 25 °C convention, and shows the ion concentration used.
Formula and steps
- Normalize the concentration to mol/L.
- For a strong acid, set [H⁺] equal to the concentration and calculate pH = −log10([H⁺]).
- For a strong base, set [OH⁻] equal to the concentration, calculate pOH, then use pH = 14.00 − pOH.
Use the Molarity Calculator when your starting data is a mass and final solution volume.
Assumptions and limits
The model is intentionally narrow: complete dissociation, one charged proton or hydroxide equivalent, ideal concentration behavior, and 25 °C water. It is not a weak-acid solver, buffer solver, titration curve, activity model, or safety assessment.
Frequently asked questions
Does this calculate weak-acid pH?
No. Use a weak-species or buffer model when dissociation is incomplete.
Why does temperature matter?
The pOH = 14 − pH shortcut uses the 25 °C water convention.