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Water is di-hydrogen oxide (H2O); to make hydrogen, it is necessary to split the hydrogen off from the oxygen. This is most often done by electrolysis. A small amount of acid is mixed with the water to make it conductive, then two electrodes are placed in the water. An electric current is passed through the water from one electrode to the other, and the current breaks the water molecules apart; hydrogen appears at one electrode, while oxygen appears at the other.

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16y ago

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