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

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

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

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