basic

Percent Dissociation of Weak Acid Calculator

α from Ka and initial concentration (small-x approximation).

Compute the percent dissociation α of a weak acid from its Ka and initial molar concentration using the small-x approximation: α = √(Ka / C₀) · 100. Use only when α < 5 %.

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

Inputs

mol/L

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 / C₀) · 100

In depth

Compute the percent dissociation α of a weak acid from its Ka and initial molar concentration using the small-x approximation: α = √(Ka / C₀) · 100. Use only when α < 5 %.