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pH Calculator
Convert between pH and hydrogen ion concentration.
Inputs
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Result
Your answer appears here.
Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
pH = −log₁₀([H⁺]); [H⁺] = 10^(−pH)
- [H⁺]
- Hydrogen-ion concentration (mol/L)
pH is a logarithmic scale. Each unit is 10× more concentrated in H⁺. pH < 7 is acidic, > 7 is basic, 7 is neutral.
Example: Pure water at 25°C: [H⁺] = 10⁻⁷ M → pH = 7 (neutral)
Ref: Sørensen (1909); IUPAC definition
Tips
- 💡 pH < 7 is acidic, > 7 is basic, 7 is neutral. Each unit is 10× more concentrated in H⁺.
- 💡 Pure water at 25°C has pH 7. At 50°C it's about 6.6 — temperature matters.