[ibach]

Hi all, I'm not a chemist and need help about this...

I have 12v dc source that i need to divide to several electrodes in sodium bicarbonate solution so every electrode has about 1.6 v in order to increase efficiency of electrolysis.
My electrodes should be made of graphite to avoid any corrosion during the process.

What i do not know is:

How to calculate resistance of the solution in dependance of concentration and distance between electrodes.

What is the physical link between surface area of electrodes and voltage on the electrode (how does the voltage spread throughout surface of the electrode submerged in solution).