🎓 Chemistry • Acids & Bases
100% Client-Side Privacy
pOH Calculator (pOH = -log[OH⁻])
Calculates hydroxide ion concentration [OH⁻] and pOH, linking directly to solution pH via pH + pOH = 14.
What is pOH?
pOH is the negative logarithm of the hydroxide ion concentration [OH⁻], reflecting the alkalinity of an aqueous solution.
Formula & Step-by-Step Calculation
pOH = -log₁₀[OH⁻], pH + pOH = 14.00 (at 25°C)
Hydroxide ion logarithm and water autoionization relationship.
Worked Step-by-Step Examples
Example 1
Solution with [OH-] = 1.0 × 10⁻³ M
Solution: pOH = 3.00, pH = 11.00 (Basic)
• pOH = -log10(1e-3) = 3; pH = 14 - 3 = 11
Common Real-World & Academic Use Cases
- ✓ Alkaline industrial cleaning baths
- ✓ Wastewater caustic neutralization
- ✓ Soap and detergent formulation
How to Use the pOH Calculator (pOH = -log[OH⁻])
1
Input pH or pOH
Enter value.
2
Review Equilibrium
Inspect [OH⁻] and alkalinity status.
Frequently Asked Questions
Q: What is Kw in water?
Kw is the ion product constant of water: 1.0 × 10⁻¹⁴ at 25°C.