pH to H⁺ Ion Concentration Calculator
Convert pH values into hydrogen ion concentration [H⁺] in mol/L using the formula 10-pH.
Enter pH Value
Formula: [H⁺] = 10-pH
Result
What does the value mean?
- pH < 7 → Acidic (High hydrogen ion concentration)
- pH = 7 → Neutral (Pure water)
- pH > 7 → Basic (Low hydrogen ion concentration)
pH to Hydrogen Ion Concentration — Chemistry Tutorial
This pH to H⁺ ion concentration calculator converts a measured pH value into [H⁺] mol/L instantly. It is widely used in chemistry labs, water treatment, hydroponics, environmental science, aquariums, and wastewater analysis to assess how acidic or basic a water sample is.
How does pH relate to hydrogen ions?
The pH scale is logarithmic, which means that each unit change in pH represents a 10× shift in hydrogen ion concentration. The formula used is:
[H⁺] = 10-pH mol/L
Example: Pure water has a pH of 7, so:
[H⁺] = 10⁻⁷ = 0.0000001 mol/L
Common pH and [H⁺] chart
| pH | [H⁺] Concentration | Water Condition |
|---|---|---|
| 0 | 1 mol/L | Very strong acid |
| 3 | 0.001 mol/L | Acidic soft drinks |
| 7 | 10⁻⁷ mol/L | Neutral pure water |
| 9 | 10⁻⁹ mol/L | Mildly basic |
| 14 | 10⁻¹⁴ mol/L | Very strong base |
Where do we need a pH → [H⁺] conversion?
- Water quality testing in drinking water
- Wastewater treatment & environmental monitoring
- Aquarium and fish care pH monitoring
- Hydroponics plant systems
- Industrial chemical processes
- School & university chemistry studies
A shift of only 0.3–0.5 pH can mean a major change in acidity. That is why converting to [H⁺] is better for understanding the true impact on biological and environmental systems.
Safe comparison examples
- pH 6 vs pH 7: 10× more acidic
- pH 3 vs pH 7: 10,000× more acidic
- pH 8 vs pH 7: 10× more basic
This tool helps transform traditional pH readings into precise molarity values for scientific interpretation.