Hydrogen Ion Concentration Calculator
Free calculate hydrogen ion concentration [h⁺], ph, poh, and hydroxide ion concentration for acids and bases.
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pH
Results
Enter solution data to calculate ion concentrations
pH and Ion Concentration Formulas
pH and pOH
pH = -log[H⁺]
pOH = -log[OH⁻]
pH + pOH = 14
- • [H⁺] = 10^(-pH)
- • [OH⁻] = 10^(-pOH)
- • Kw = [H⁺][OH⁻] = 1×10⁻¹⁴
- • pH < 7: Acidic
- • pH > 7: Basic
Weak Acid/Base
[H⁺] = √(Ka × [HA])
[OH⁻] = √(Kb × [B])
- • Ka = Acid dissociation constant
- • Kb = Base dissociation constant
- • Ka × Kb = Kw
- • Valid for dilute solutions
- • Assumes negligible ionization