pOH Calculator

Calculate pOH from hydroxide ion concentration [OH⁻] or vice versa. pOH = -log₁₀[OH⁻]

Calculation Type *

Significant Figures

Hydroxide Ion Concentration [OH⁻] *

Enter concentration in mol/L (M). Use scientific notation like 1e-4

Show Steps

Temperature

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pOH Result

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pH/pOH Scale

Visual representation on the pH/pOH scale

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Calculation Breakdown

Step-by-step calculation

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pOH

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-log[OH⁻]

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[OH⁻]

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mol/L

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14 - pOH

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[H⁺]

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mol/L

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Solution Classification

Based on pOH value

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pOH Formulas

Key formulas and relationships

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pOH Tips

Understanding pOH

📊 Chemical Disclaimer: This calculator uses standard relationships (pOH = -log[OH⁻], pH + pOH = 14 at 25°C). Results are for educational purposes.