pH Calculator
Chemistry & BiologyCalculate the pH of a solution from its hydrogen ion concentration.
pH
The pH of the solution, calculated as the negative base-10 logarithm of hydrogen ion concentration.
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Frequently Asked Questions
What does the pH scale measure?
The pH scale measures how acidic or basic a solution is, ranging from 0 (highly acidic) to 14 (highly basic), with 7 considered neutral at standard conditions, based on the concentration of hydrogen ions present.
Why is the pH formula logarithmic?
Hydrogen ion concentration can span an enormous range across different solutions, so the logarithmic pH scale compresses this range into a simple, manageable number — each whole pH unit represents a tenfold change in hydrogen ion concentration.
How can I measure hydrogen ion concentration in practice?
In a lab setting, pH is typically measured directly using a calibrated pH meter or pH indicator strips, rather than measuring hydrogen ion concentration separately and calculating backward.
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