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Weak-Acid ICE Table Calculator

Equilibrium [H⁺] from Ka and initial acid concentration.

Solve the Initial-Change-Equilibrium (ICE) table for a weak monoprotic acid HA ⇌ H⁺ + A⁻ exactly using the quadratic formula. Reports [H⁺], pH, % dissociation, and the equilibrium [HA].

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

x² + Ka·x − Ka·C₀ = 0 ⇒ [H⁺] = (−Ka + √(Ka² + 4·Ka·C₀)) / 2.

In depth

Solve the Initial-Change-Equilibrium (ICE) table for a weak monoprotic acid HA ⇌ H⁺ + A⁻ exactly using the quadratic formula. Reports [H⁺], pH, % dissociation, and the equilibrium [HA].