What is Sulfur Trioxide?
Sulfur trioxide is a chemical compound which is represented by chemical formula SO3. Sulfur trioxide exists in a number of modifications that differ in molecular species and crystalline form. In its liquid for it is colourless and fumes in air at ambient conditions. It is a highly reactive substance and a strong oxidising agent and it also acts as a fire hazard. It is thermodynamically unstable compound with respect to selenium dioxide.
Other names – Sulfuric anhydride
|Molecular Weight/ Molar Mass||80.066 g/mol|
|Boiling Point||44.9 °C|
|Melting Point||16.9 °C|
Sulfur Trioxide Structure – SO3
Physical Properties of Sulfur Trioxide – SO3
|Appearance||Colourless to white crystalline solid|
|Hydrogen Bond Acceptor||3|
|Solubility||Soluble in water.|
Chemical Properties of Sulfur Trioxide – SO3
- Sulfur trioxide reacts with water forming sulfuric acid. The chemical equation is given below.
SO3 + H2O → H2SO4
- Sulfur trioxide reacts with a base sodium hydroxide forms sodium hydrogen phosphate. The chemical equation is given below.
SO3 + NaOH → NaHSO4
Uses of Sulfur Trioxide – SO3
- Used as a bleaching agent to remove residual hydrogen peroxide, or as a digesting agent to separate pulp from lignin.
- Used as a catalyst in the oxidation reaction of sulfur dioxide to sulfur trioxide.
- It is a strong inorganic acid mists containing sulfuric acid used in industry or in production of commercial products.
- Used as an essential reagent in sulfonation reaction.
- Used in the manufacture of photoelectric cells and solar energy devices.