pH Calculator
Calculate pH, pOH & Ion Concentrations
Calculate pH from ion concentrations or vice versa. Get pOH, H⁺ and OH⁻ concentrations, and acid-base classification.
Calculate pH
Enter pH value (typically 0-14)
Key Formulas
pH = -log[H⁺]
pOH = -log[OH⁻]
pH + pOH = 14
[H⁺] × [OH⁻] = 10⁻¹⁴
Important Note
This calculator is for educational purposes. For precise measurements, use calibrated pH meters and proper laboratory techniques.
About pH
pH is a measure of the acidity or alkalinity of a solution. It is defined as the negative logarithm of the hydrogen ion concentration.
The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic, and values above 7 are alkaline (basic).
pH Scale:
- ●0-3: Strongly Acidic
- ●3-7: Weakly Acidic
- ●7: Neutral
- ●7-11: Weakly Alkaline
- ●11-14: Strongly Alkaline
Applications
pH measurement is crucial in many fields:
- Water quality testing and treatment
- Agriculture and soil management
- Food and beverage production
- Swimming pool maintenance
- Medical and biological research
- Chemical manufacturing
- Aquarium and fishkeeping
pH Scale Reference
| pH | Classification | Examples |
|---|---|---|
| 0-2 | Strongly Acidic | Battery acid, Stomach acid |
| 3-6 | Weakly Acidic | Lemon juice, Vinegar |
| 7 | Neutral | Pure water |
| 8-10 | Weakly Alkaline | Baking soda, Seawater |
| 11-14 | Strongly Alkaline | Bleach, Drain cleaner |
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