pH of Pure Water ([H⁺] = 1×10⁻⁷ mol/L)
Pure water has an [H⁺] concentration of 1×10⁻⁷ mol/L, giving a pH of exactly 7.
How to use this tool
- Enter h⁺ concentration [h⁺] in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your ph and the full breakdown beneath it.
Confirm that pure water at 25 °C is neutral with a pH of 7.
Frequently asked questions
- What everyday substances have known pH values?
- Lemon juice ~2, coffee ~5, pure water 7, baking soda ~9, bleach ~12.
- Does pH change with temperature?
- Yes. Pure water at 25 °C has pH 7, but at 100 °C it has pH ~6.1 — still neutral because both H⁺ and OH⁻ concentrations rise equally.