Quote Originally Posted by Xei View Post
How did you measure the speed of the reaction? Current?

I don't see how you don't know it was going faster because you just put a load of ions in the solution which could actually be electrolysed, far in excess of the number of ions naturally present in pure water.
Our rig consisted of tubes over either end of the electrodes. As the water was electrolyzed, the gas would displace the water. Using a stopwatch, we timed several concentrations of ions and marked how much gas was produced. Not extremely precise, but we did observe a very noticeable difference. We used HCl as our ion source.