pH Calculator
Calculate pH, pOH, [H+], and [OH-] concentrations. Convert between different acidity measurements.

Use scientific notation (e.g., 1e-7 for 10⁻⁷)

Use scientific notation (e.g., 1e-7 for 10⁻⁷)

Results
3.00
pH
11.00
pOH
1.00e-3
[H⁺] mol/L
1.00e-11
[OH⁻] mol/L
Acidic Solution

Key Relationships

pH + pOH = 14 (at 25°C)
pH = -log₁₀[H⁺]
pOH = -log₁₀[OH⁻]
[H⁺][OH⁻] = 10⁻¹⁴ (Kw at 25°C)

pH Scale:

  • pH < 7: Acidic
  • pH = 7: Neutral
  • pH > 7: Basic (Alkaline)

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