SiO2 Chemical Properties

The chemical properties 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. Reacts with hot concentrated alkali solution or molten alkali to produce silicate and water. Reacts with a variety of metal oxides at high temperatures to form silicates. The nature of silica is inactive. It does not interact with halogens, hydrogen halides, sulfuric acid, nitric acid, and perchloric acid other than fluorine and hydrogen fluoride (except hot concentrated phosphoric acid).