What is the molecular formula of oleum?
|Chemical Names:||OLEUM; Fuming sulfuric acid; Sulfuric acid, fuming; Oleum iodisum; Sulfuric acid fuming; Sulfuric acid (fuming) More|
|Molecular Formula:||H2SO4.O3S or H2O7S2|
|Molecular Weight:||178.129 g/mol|
Oleum is produced in the contact process, where sulfur is oxidized to sulfur trioxide which is subsequently dissolved in concentrated sulfuric acid.
- Vanadium (V) oxide (V2O5) is used as a catalyst for the oxidation of sulfur dioxide to sulfur trioxide. It is able to catalyze this reaction because it releases oxygen (O2) when heated up. The production of SO3 is important commercially since it is used to make sulfuric acid on industrial scale.
- Sulphur occurs naturally in the environment and is the thirteenth most abundant element in the earth's crust. It can be mined in its elemental form, although this method has declined over the last decade to less than 2% of world production.
- Sulfuric acid is manufactured in the Contact process. First, sulfur is burned in air to give sulfur dioxide. Then sulfur dioxide is mixed with more air to yield sulfur trioxide in a reversible reaction. The gases pass through layers of vanadium(V) oxide catalyst which also increase the rate of reaction.
Oleum is made by dissolving Sulfur Trioxide into Sulfuric Acid. Sulfur Trioxide is made from Sulfur Dioxide in the presence of a catalyst. It is used in the oil refining process to make crude oil distillates into higher quality materials.
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In the first step, sulfur is burned to produce sulfur dioxide. This is then oxidized to sulfur trioxide using oxygen in the presence of a vanadium(V) oxide catalyst. This reaction is reversible and the formation of the sulfur trioxide is exothermic. ), also known as fuming sulfuric acid.
- The better approach is to lead the gas out of the generator through a tube and into a chilled container of water. The last way of making pure nitric acid is to react concentrated sulfuric acid and a pure nitrate salt (NOT fertilizer) and heat it in a glass distillation apparatus to distill over the pure nitric acid.
- Nitric acid is made by reaction of nitrogen dioxide (NO2) with water. Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide. Bubbling nitrogen dioxide through hydrogen peroxide can help to improve acid yield.
- because you used the term “concentrated sulfuric acid” it is necessarily a mixture (the key term being “concentrated”). It IS possible to create 100% H2SO4. Whether that is considered a 'pure substance' or a mixture of H2O+SO3 or a mixture of H2, S, and O2 depends on the conditions of your observation.
Updated: 26th September 2018