pH, pOH, [H₃O⁺] & [OH⁻] calculator
Calculate pH, pOH, hydronium concentration or hydroxide concentration at 25 °C from one known value.
Enter exactly one value among pH, pOH, [H₃O⁺] and [OH⁻]. The other three values are calculated automatically.
Reference: aqueous solution at 25 °C, with pKᵥ = 14.00 and Kᵥ = 1.0 × 10⁻¹⁴.
Strictly, pH is defined from hydrogen-ion activity. Formulas using [H₃O⁺] are the common concentration approximation for sufficiently dilute solutions.
Results
Solution character at 25 °C: -