pH a partir pOH
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
This calculator determines the pH of a solution from the pOH value using the fundamental chemistry relation: pH + pOH = 14. Simply input the pOH, and the result is automatically computed. pH measures acidity or basicity, while pOH indicates hydroxide ion (OH⁻) concentration.
The calculation is useful in chemistry experiments, lab classes, or water analysis. For example, a pOH of 3 yields a pH of 11, indicating a strongly basic solution. The formula is straightforward: subtract pOH from 14. This streamlines data interpretation in labs, where accuracy is critical.
Caution: pOH values above 14 or below 0 are invalid, as pH and pOH range between 0 and 14. Common errors include using the reversed formula (pOH = 14 - pH) or confusing pH with H⁺ concentration. Always check units and measurement context.
Frequently asked questions
How do pH and pOH relate?
pH and pOH are inversely proportional, always summing to 14. If pOH increases, pH decreases, and vice versa.
What are practical uses for this calculation?
It is used in analytical chemistry for titrations, solution analysis, or ionic equilibrium studies.
Can I input negative pOH values?
No. Valid pOH values range from 0 to 14, as pH and pOH share this range.
When should I use this calculator instead of another?
Use it when you already have the pOH and need the pH quickly without manual calculations.
Why is the formula pH = 14 - pOH?
Because the sum of pH and pOH in aqueous solutions is always 14, based on water's ionization constant (Kw = 10⁻¹⁴).