Hydrogen is one of the easiest gases to prepare. You can do it at home, using water! The easiest method uses electricity from a battery to split water, H2O, to release hydrogen gas, H2. This electrolysis method can be improved several ways, plus there are several other reactions that produce hydrogen... Learn how
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Feel I’m missing something. How do you invert a container with water in it?
Just put your finger over the opening, turn it upside down and uncover it once the mouth is underwater.