I don't understand why that happens. Wouldn't that make the reaction not a redox reaction?
For example: Na2SO4 (aq)
I have another question about this one: why does Na+(aq) + e- --> Na(s) occur in the cathode instead of the water reduction reaction? The Na+(aq) half reaction potential is -2.71 which is a lot lower than that of water. I thought the most positive reaction is the reaction that will occur.