pH Scale Simulator
Test everyday liquids and see pH, hydrogen and hydroxide ions, and acid or base.
pH7
[H⁺] mol/L1×10⁻⁷
[OH⁻] mol/L1×10⁻⁷
pOH7
TypeNeutral
What you can learn
- pH = −log₁₀[H⁺]. Each step down the scale is ten times more acidic.
- At 25 °C, pH + pOH = 14 and [H⁺] × [OH⁻] = 10⁻¹⁴.
- pH 7 is neutral, below 7 is acidic and above 7 is basic.
Frequently asked questions
What does pH actually measure?
The concentration of hydrogen ions in a solution, on a logarithmic scale. Lower pH means more hydrogen ions and a stronger acid.
Why is a pH change of 1 such a big deal?
Because the scale is logarithmic. pH 3 has ten times more hydrogen ions than pH 4 and a hundred times more than pH 5.