Titanium dioxide (TiO2) is a versatile compound with various reactions depending on its form and conditions. Some common reactions include:
1. **Photocatalytic Reaction:** TiO2 can undergo a photocatalytic reaction when exposed to UV light. It can oxidize organic compounds and break down pollutants in the presence of oxygen.
2. **Acid-Base Reactions:** TiO2 can react with strong acids and bases. In an acidic environment, it can dissolve to form titanium salts. In a basic environment, it can form titanium oxide complexes.
3. **Reduction Reactions:** Reduction of TiO2 can be achieved by using hydrogen or other reducing agents, leading to the formation of titanium metal.
4. **Combustion Reaction:** When heated to high temperatures in the presence of a reducing agent, TiO2 can react to form titanium metal and release oxygen.
5. **Formation of Complexes:** In the presence of certain ligands, TiO2 can form coordination complexes, which have applications in catalysis and materials science.
The specific reaction of TiO2 will depend on factors such as its crystal structure, particle size, and the environment in which it is placed.