pH Calculator
Enter either the hydrogen ion concentration [H⁺] or a pH value directly to get the exact pH and pOH, using pH = −log₁₀[H⁺] and pOH = 14 − pH.
A positive number, e.g. 1e-3 or 0.001
FAQs
Why does pOH = 14 − pH specifically?
That relationship holds at 25°C, where the ion-product constant of water (Kw) is 1×10⁻¹⁴ — the standard reference condition used in school and college chemistry. At a different temperature, Kw changes and so would this relationship.
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