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Ion Transport is by Connvection and Diffusion. Only very small Part by Migration. As Long as there is no anodic and cathodic reaction I would say the concentration is Not changing in any Part of the Solution.


This is really physical chemistry, but since the question is here: When you electrolyse solutions you need to consider secondary reactions that might take place at the electrodes. For example if you produced sodium at the cathode it would immediately react with water to produce Na$^+$ and hydrogen. Therefore the cathode produces H$_2$ not sodium metal. ...

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