pOH Calculator

Calculate Solution pOH and Ion Concentrations

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pOH from [OH⁻] Calculator

Calculate pOH from hydroxide ion concentration.

pOH: -

[OH⁻] from pOH Calculator

Calculate hydroxide ion concentration from pOH.

[OH⁻]: - mol/L

pOH from Kb Calculator

Calculate pOH of a weak base solution using Kb.

Results will appear here

Understanding pOH

What is pOH?

pOH is the negative logarithm (base 10) of the hydroxide ion concentration [OH⁻]. The formula is:

pOH = -log₁₀[OH⁻]

pH + pOH = 14

pOH Scale

The pOH scale is complementary to pH:

  • pOH > 7: Acidic
  • pOH = 7: Neutral
  • pOH < 7: Basic
  • Each unit = 10× change

Applications

pOH is useful for:

  • Base calculations
  • Buffer solutions
  • Titrations
  • Chemical equilibria

Common Solutions

Typical pOH values:

  • NaOH (1M): ~0
  • Pure water: 7.0
  • NH₃ (1M): ~4.8
  • Blood: ~6.6