How do you remove all calcium carbonate from silica?
Dilute nitric acid can also be used, but it is not possible to add sulphuric acid because it is also precipitated by CaSO4.
The removal method: because the calcium carbonate reacts with hydrochloric acid to produce gas and solution, silica does not react and does not dissolve, so it is filtered and separatedEquation: CaCO3+2HCL=CaCl2+CO2! +H20!
Strengthening alkali concentrated solution heatingCalcium carbonate can be obtained by filtration and washing2NaOH + SiO2 = heating = Na2SiO3 + H2OSodium silicate is soluble in water and calcium carbonate does not react with alkali
