What would you use as the solution to collect hydrogen and oxygen at the electrodes? The teacher has suggested "sodium nitrate (or similar!)" on their order. I've never done it with sodium nitrate (does it work? Is there anything better?!) and before I spend lots of time trialling it I thought I'd ask the hive mind on here! I have used water before with a bit of sodium hydrogen carbonate to act as the electrolyte. When I did the hydrogen collected at the cathode popped ok when tested but the oxygen from the anode didn't do much and wouldn't relight a spill. Any help/advice gratefully received!