Violet cloud of cobalt silicate

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


Cobalt Silicate

Удивительный опыт - Осаждение силиката кобальта


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Reaction formula

Na2SiO3 + CoCl2 → CoSiO3 + 2NaCl

Step-by-step instruction

  1. Prepare a beaker.
  2. Fill it with sodium silicate.
  3. Add the solution of cobalt chloride.
  4. Observe the formation of violet precipitate.

Scientific background

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.


Published on 14 June 2015

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