How to use the common ion effect solubility calculator
Find the reduced solubility in the presence of a common ion. Enter ksp (1:1 salt), common ion concentration in the fields above; the solubility, solubility without common ion are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- Ksp — Ksp (1:1 salt)
- C — Common ion concentration (mol/L)
Worked example
With ksp (1:1 salt) = 1.8e-10, common ion concentration = 0.1 mol/L, the calculator gives solubility ≈ 1.8 × 10⁻⁹ mol/L; solubility without common ion ≈ 1.3416 × 10⁻⁵ mol/L.
Frequently asked questions
What is the formula for the common ion effect solubility calculation?
Solubility (mol/L) = Ksp / C. Solubility without common ion (mol/L) = √(Ksp). Here Ksp is ksp (1:1 salt), C is common ion concentration (mol/L).
What inputs do I need for the common ion effect solubility calculator?
You need ksp (1:1 salt), common ion concentration in mol/L. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.