Donnan Equilibrium Calculator
Calculate ion distribution across membranes with non-diffusible charged species
Non-Diffusible Species (Inside)
Assuming 1:1 electrolyte (e.g., NaCl)
About Donnan Equilibrium
The Donnan equilibrium occurs when charged macromolecules (proteins, DNA, polyelectrolytes) cannot cross a semipermeable membrane while small ions can. This leads to unequal distribution of permeable ions.
Applications: Cell physiology, dialysis, gel swelling, ion exchange membranes, and colloidal systems.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Chemistry: The Central Science
by Brown, LeMay, Bursten
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.