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 P: 16 Hello, I've heard that when you are considering a Gibbs-Donnan equilibrium, that is if you have for example a situation like this: There are two compartments 1 and 2 divided by a membrane, and at the beginning you have: In compartment 1 a neutral solution of permeable ions H+ and Cl-; In compartment 2 a neutral solution of permeable ions H+ and an anion that is impermeable to the membrane; water can pass through the membrane. I've read that not only at the beginning but also at equilibrium each compartment is electrically neutral. Let's suppose now to have another situation: you have two solutions of NaCl at different concentrations, and between them a membrane that lets through only Na+ and not water nor Cl-. In this case does the electroneutrality hold when the system is at equilibrium too? if not, why? Thank you