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I've done some research on google but most guides I've seen recommend adding salt to the mixture for better conductance which results in the release of chlorine.
Is there a way to perform electrolysis on water that releases hydrogen and at the same time does not release any gases that are harmful to humans? By that I mean can I use another electrolyte that does not produce harmful side effects (so sulfuric acid is also out, and I do realize it's next to impossible to do electrolysis on distilled water.)
I'm looking for a way to show this experiment to kids in enclosed space without good ventilation.