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Percent Ionization of a Weak Acid Calculator

% ionization from Ka and initial concentration.

Compute the percent ionization of a weak monoprotic acid: % ionization = ([H⁺] / C₀) · 100, with [H⁺] ≈ √(Ka · C₀). Useful for predicting how dilution increases dissociation.

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

% ionization = √(Ka / C₀) · 100

In depth

Compute the percent ionization of a weak monoprotic acid: % ionization = ([H⁺] / C₀) · 100, with [H⁺] ≈ √(Ka · C₀). Useful for predicting how dilution increases dissociation.