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Degree of Ionization from Ka and Concentration Calculator

α ≈ √(Ka / C) for a weakly-dissociating monoprotic acid.

Compute the fractional degree of ionization α of a weak monoprotic acid (HA ⇌ H⁺ + A⁻) using the dilute-solution approximation α ≈ √(Ka / C). Reports % ionization and the equilibrium [H⁺].

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

Inputs

mol/L

Results

Enter values and click Calculate to see 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

α ≈ √(Ka / C); [H⁺] ≈ α · C; valid for α < ~0.05.

In depth

Compute the fractional degree of ionization α of a weak monoprotic acid (HA ⇌ H⁺ + A⁻) using the dilute-solution approximation α ≈ √(Ka / C). Reports % ionization and the equilibrium [H⁺].