Conductivity of water?

Question

is there a formulea for working out how the conductivity of de-ionised water changes at different temps? Trying to maintain a steady 20amps when doing electrolysis but it changes with temp.

Answer 1

de-ionized water is a poor conductor, i don't see how you can get 20 amps through it.

If you want a steady 20 amps for some reason, use a constant current controller.

distilled water has a conductivity of 2 S/m

drinking water 0.05 S/m

Taking the 2 S/m number, if you have 0.1 m² plates separated by 0.01m, then conductivity would be

2 S/m x 0.1 m²/0.01m = 2 mS

which is 500 ohms. to get 20 amps through that you would need 10000 volts.

using the 0.05 S/m number

0.05 S/m x 0.1 m²/0.01m = 50 uS

which is 20k ohms.