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Debye–Hückel Activity Coefficient from Ionic Strength Calculator

log γ = −A·z²·√I from the limiting law.

Calculates the mean activity coefficient using the Debye–Hückel limiting law: log γ± = −A · |z+·z−| · √I, where A ≈ 0.509 in water at 25 °C and I is ionic strength.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mol/kg

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

log γ = −0.509 · z² · √I

In depth

Calculates the mean activity coefficient using the Debye–Hückel limiting law: log γ± = −A · |z+·z−| · √I, where A ≈ 0.509 in water at 25 °C and I is ionic strength.