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Common-Ion Effect Solubility Calculator

New molar solubility when a common ion is present.

Compute the new molar solubility of a 1:1 salt MA in a solution that already contains a common-ion concentration [A⁻], using s ≈ Ksp / [A⁻] when the common ion is in excess.

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

s ≈ Ksp / [common ion] (in excess of the salt's own solubility).

In depth

Compute the new molar solubility of a 1:1 salt MA in a solution that already contains a common-ion concentration [A⁻], using s ≈ Ksp / [A⁻] when the common ion is in excess.