Calculate pH from hydrogen ion concentration [H⁺], or find [H⁺] from pH. Also get pOH and hydroxide concentration [OH⁻].
Acidic
| pH | 3.0000 |
| Classification | Acidic |
| [H⁺] mol/L | 1.0000e-3 |
| pOH | 11.0000 |
| [OH⁻] mol/L | 1.0000e-11 |
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pH = -log₁₀[H⁺]
[H⁺] = 10^(-pH)
pH + pOH = 14 (at 25°C)
pH is a scale (0–14) measuring acidity or alkalinity. pH 7 is neutral. Below 7 is acidic; above 7 is basic (alkaline).
pH = -log₁₀[H⁺], where [H⁺] is the molar concentration of hydrogen ions (mol/L).
pOH = -log₁₀[OH⁻]. At 25°C, pH + pOH = 14. If pH = 4, then pOH = 10.
Battery acid: 0, Lemon juice: 2, Vinegar: 3, Coffee: 5, Water: 7, Baking soda: 9, Bleach: 12.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.