pH Calculator
[H⁺] mol/L
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pH is the negative base-10 logarithm of hydrogen ion concentration [H⁺]. This calculator converts between [H⁺] (mol/L) and pH — the fundamental measure of acidity.
- 1pH = −log₁₀([H⁺])
- 2[H⁺] = 10^(−pH)
- 3pH < 7: acidic; pH 7: neutral; pH > 7: alkaline
- 4Each pH unit = 10× change in [H⁺]
[H⁺] = 0.001 mol/L=pH = −log(0.001) = 3 (acidic)
pH = 11=[H⁺] = 10⁻¹¹ mol/L (strongly basic)
| Substance | pH | Category |
|---|---|---|
| Gastric acid | 1–2 | Highly acidic |
| Lemon juice | 2–3 | Acidic |
| Coffee | 5 | Mildly acidic |
| Pure water | 7 | Neutral |
| Blood | 7.4 | Mildly basic |
| Bleach | 12–13 | Strongly basic |
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