Chemical equation of the reaction between silicon dioxide and sodium hydroxide

The reaction equation of silica and sodium hydroxide: SiO2+2NaOH=Na2SiO3+H2O.

Silicon dioxide is an inorganic substance, and its chemical formula is SiO2. The long-range ordered arrangement of silicon atoms and oxygen atoms forms crystalline silicon dioxide, and the short-range ordered or long-range disordered arrangement forms amorphous silicon dioxide. In the silica crystal, the silicon atom is located at the center of the regular tetrahedron, and four oxygen atoms are located at the four corners of the regular tetrahedron.

Chemical properties of silicon dioxide

The chemical properties of silicon dioxide are relatively stable. Does not react with water. It is an acidic oxide and does not react with ordinary acids. Hydrofluoric acid reacts with silicon dioxide to produce gaseous silicon tetrafluoride. React with hot concentrated alkali solution or molten alkali to form silicate and water. React with various metal oxides at high temperature to form silicates.

Common concentrated phosphoric acid (or pyrophosphoric acid) can corrode silicon dioxide to form heteropoly acid at high temperature, and molten borate or boric anhydride can also corrode silicon dioxide at high temperature. In view of this property, borate can be used as a flux in ceramic firing, and hydrogen fluoride can also be an acid, which can dissolve silicon dioxide and generate water-soluble fluorosilicic acid.