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Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water.

Using electrolysis, learners produce hydrogen gas and oxygen gas from water molecules in a solution.

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

In this activity, learners build a simple electrolysis device. Then learners use an indicating solution to visualize hydrogen and oxygen molecules in water.