The pH scale measures acidity and alkalinity from 0 to 14. pH = -log10[H+], where [H+] is hydrogen ion concentration in mol/L.
Neutral, Acidic, Basic
pH 7 is neutral (pure water at 25C). Below 7 is acidic; above 7 is basic. Each unit represents a tenfold change in H+ concentration.
Calculate pH
Given [H+] = 1e-3 M, pH = 3. Use our pH Calculator for any concentration.
Real Applications
Pool maintenance, soil testing, blood analysis, and food preservation all rely on pH measurements.
Going Deeper
Calculate pH from hydrogen ion concentration and understand the scale. This guide connects theory to practice — use the related calculators linked at the bottom to verify each example with your own numbers.
Practical Tips
- Write down given values and unknowns before opening the calculator.
- Check units and rounding rules appropriate to your context (class, lab, or business).
- Compare manual working with the calculator result to build confidence.
Common Mistakes to Avoid
- Rushing inputs without reading field labels carefully.
- Confusing similar formulas that use different variables or units.
- Reporting results with more precision than your inputs justify.
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