- Prepare a water solution of copper sulfate in a one beaker and a water solution of sodium silicate in another.
- Gradually add the copper sulfate solution to the sodium silicate solution. A blue friable precipitate is formed.
Blue friable precipitate is formed in a beaker filled with a clear solution
Scientific name: CuSiO<sub>3</sub> formation
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CuSO4 + Na2SiO3 → CuSiO3 + Na2SO4
Both copper sulfate and sodium silicate are soluble in water, but copper silicate is insoluble. The blue copper silicate precipitate is formed when solutions of copper sulfate and sodium silicate are mixed.