- Prepare a beaker.
- Fill it with sodium silicate.
- Add the solution of cobalt chloride.
- Observe the formation of violet precipitate.
Violet cloud is formed in the beaker.
Scientific name: Reaction of cobalt chloride and sodium silicate solutions produces a violet precipitate of amorphous cobalt silicate
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Na2SiO3 + CoCl2 → CoSiO3 + 2NaCl
Many metals form insoluble precipitates by reacting with the solution of sodium or potassium silicate. When solutions of cobalt chloride and sodium silicate are mixed a violet precipitate forms. It is amorphous cobalt silicate. Since this material has an amorphous structure, composition can vary widely depending on the preparation conditions.