Silicon dioxide is an acidic oxide, which is a solid at room temperature and is widely used. It is mainly used for making glass, water glass, pottery, enamel and so on.
Pure natural silica crystal is a hard, brittle, insoluble, colorless and transparent solid, which is often used in the manufacture of optical instruments.
There is rich surface hydroxyl on the surface of silicon dioxide. It is a common polar group with the chemical formula-OH. Hydroxyl has some similar properties to water. Hydroxyl is a typical polar group and can form hydrogen bond with water.
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