Ohm’s Law Calculator
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pH Calculator
Convert between H⁺ concentration and pH, with pOH and acidity.
Result
—
Acidity.
| pH | — |
|---|---|
| pOH | — |
| [H⁺] | — |
| Classification | — |
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How the pH Calculator Works
pH measures how acidic or basic a solution is, on a scale from 0 to 14. It’s the negative base-10 logarithm of the hydrogen-ion concentration: pH = −log₁₀[H⁺]. A concentration of 0.0001 (10⁻⁴) mol/L gives a pH of 4 — acidic. Below 7 is acidic, 7 is neutral, above 7 is basic.
You can go either way: enter the [H⁺] concentration to get the pH, or enter a pH to get the concentration back. The calculator also gives the pOH, which is simply 14 − pH.
pH = −log₁₀[H⁺] · pOH = 14 − pH
Frequently Asked Questions
How do you calculate pH?
Take the negative base-10 logarithm of the hydrogen-ion concentration in mol/L. For 10⁻⁴ mol/L, pH = 4.
What pH is acidic or basic?
Below 7 is acidic, exactly 7 is neutral (pure water), and above 7 is basic or alkaline.
What is pOH?
The hydroxide-ion counterpart of pH. At 25°C, pH + pOH = 14.
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