- Prepare a beaker.
- Fill it with sodium silicate.
- Add the solution of copper sulfate.
- Observe the formation of a blue-green precipitate.
Blue cloud is formed in the beaker.
Scientific name: Reaction of copper sulfate and sodium silicate solutions produces a blue-green precipitate of amorphous copper silicate
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Na2SiO3 + CuSO4 → CuSiO3 + Na2SO4
Many metals form insoluble precipitates by reacting with the solution of sodium or potassium silicate. When solutions of copper sulfate and sodium silicate are mixed a blue-green precipitate forms. It is amorphous copper silicate. Since this material has an amorphous structure, the composition can vary widely depending on the preparation conditions.