This is an acid-base reaction (neutralization): Na2CO3 is a base, SiO2 is an acid.
Reactants:
Na2CO3 – Sodium carbonate
Other names: Soda ash, Washing soda, Soda crystalsSodium carbonate (anhydrous), Na2CO3, Disodium carbonate, Natriumkarbonat, Carbonic acid sodium salt (1:2), Anhydrous sodium carbonate, Carbonic acid, disodium salt, Sodium carbonate, anhydrous, Soda-ash, Natrum carbonicum, Sodium carbonate anhydrous, Sodium salt of carbonic acid, Carbonic acid disodium salt
Appearance: White solid, hygroscopic ; White hygroscopic powder
SiO2
Products:
CO2
Names: Carbon dioxide, {{plainlist|, CO2Carbonic acid gas, Dry ice, [CO2], Carbonic anhydride, R-744, E-290, E 290, E290, Carbonic acid anhydride, Carbon-12 dioxide, Methanedione, Carbon oxide, CO₂, [Note: Normal constituent of air (about 300 ppm)].
Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]