What is Oleum?
'''Oleum''' is a [[chemical]]. It does not have a chemical formula because it is a [[mixture]], not a [[chemical compound]]. It is made by dissolving [[sulfur trioxide]] in [[sulfuric acid]]. It is part of the contact process used to make sulfuric acid. It is a fuming (releases toxic fumes) liquid. It can be dissolved in some water to produce concentrated sulfuric acid. ==Related pages== *[[Sulfurous acid]] *[[Sulfur dioxide]] *[[Sulfate]] {{chem-stub}} [[Category:Sulfur compounds]] [[Category:Acids]]