pOH base forte
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Strong Base pOH Calculator determines the hydroxide potential (pOH) of solutions containing strong bases. Strong bases like NaOH or KOH fully dissociate in water, releasing OH⁻ ions at the same molarity as the base. The formula used is pOH = -log[OH⁻], where [OH⁻] is the molar hydroxide ion concentration. This tool is crucial in analytical chemistry labs and exercises.
To use, input the molarity of the strong base. It calculates pOH directly, assuming complete dissociation. Ideal for titrations, solution preparation, or industrial pH analysis. Note that weak bases or salts require chemical equilibrium calculations instead.
Ensure accurate concentration values, as errors skew results. For polybasic bases (e.g., Ba(OH)₂), multiply the molarity by OH⁻ ions per formula unit. Temperature and ionic activity may alter results under non-ideal conditions, but this calculator assumes standard lab conditions (25°C).
pOH indicates solution basicity. Values below 7 signal strong bases, while above 7 indicate weak bases or neutral/acidic solutions. Combined with pH, it helps predict chemical reactions and substance stability in various environments.
Frequently asked questions
What is pOH?
pOH measures hydroxide ion (OH⁻) concentration in a solution, indicating its basicity. Values below 7 indicate strong bases.
How does the calculator work?
It uses pOH = -log[OH⁻], assuming strong bases fully dissociate. Input the base concentration in mol/L.
Can I use it for weak bases?
No, weak bases partially dissociate. Use equilibrium calculations with Kb for accurate pOH results.
Why does temperature affect the result?
Water's ion-product constant (Kw) varies with temperature. The calculator uses Kw = 1×10⁻¹⁴ at 25°C by default.
How to handle polybasic bases?
Multiply the base concentration by the number of OH⁻ per formula (e.g., Ba(OH)₂ releases 2 OH⁻ per mole).