Blue cloud of copper silicate

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


Steven's Chemical Garden

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Reaction formula

Na2SiO3 + CuSO4 → CuSiO3 + Na2SO4

Step-by-step instruction

  1. Prepare a beaker.
  2. Fill it with sodium silicate.
  3. Add the solution of copper sulfate.
  4. Observe the formation of a blue-green precipitate.

Scientific background

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.


Published on 14 June 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst