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?