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Sodium Silicate or Water Glass

How to Make Sodium Silicate or Water Glass

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Magic Rocks are a classic chemistry project that doesn't take a lot of time to complete.

Magic Rocks are a classic chemistry project that doesn't take a lot of time to complete. Sodium silicate is the chemical that provides the 'magic'.

Anne Helmenstine
You can prepare sodium silicate or water glass from gel beads (silica) and drain cleaner (sodium hydroxide). Sodium silicate can be used to make chemical gardens, like those that result from Magic Rocks (which you can make yourself).

Sodium Silicate Materials

All you need to make a sodium silicate solution are water, silica, and sodium hydroxide. Silica comes in those little packets labelled 'do not eat' with electronics, shoes, etc. Sodium hydroxide is readily available in its pure form or can be found as drain cleaner.
  • 6 g silica gel beads (crushed)

  • 4-8 g sodium hydroxide (4 g for water glass, used in the magic rock project, or 8 g for the stoichiometric ratio for sodium silicate)

  • 10 ml water

Prepare Sodium Silicate

  1. Wear proper safety gear, which includes gloves.

  2. Heat 4-8 grams of sodium hydroxide in 10 ml of water.

  3. Once the sodium hydroxide is dissolved, slowly add the 6 grams of crushed silica gel beads. Heat the solution between additions. If the crushed beads won't dissolve, add a little more water to the solution.

  4. That's it! You now have sodium silicate or water glass. NurdRage has a YouTube video of this procedure, if you're interested in seeing how it's done.

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