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Oleum is another name for Fuming Sulphuric Acid which, because of its composition, is often referred to as Disulphuric Acid (Pyrosulphuric Acid). It consists of varying amounts of Sulphur Trioxide in Sulphuric Acid taking the general formula ySO3.H2O where y refers to the total molar Sulphur Trioxide content. Another way of expressing the general formula is H2SO4.𝔁SO3 where 𝔁 represents the molar free Sulphur Trioxide content which is used to assay Oleum. Varying the value of 𝔁 will produce different Oleums, when 𝔁 = 1, then Disulphuric Acid (H2S2O7) is produced. In its pure form this substance is solid at room temperature with a melting point of 36 degrees C.
Oleum is produced in the 'contact process' when Sulphur Trioxide, formed by oxidation of Sulphur, is dissolved in Sulphuric Acid.
The properties of Oleums can be used to provide a safer means of transporting Sulphuric Acid compounds. Being solid at room temperature, Oleums can be shipped by tanker and converted to liquid form at their destination by steam heating, dilution or concentration.
Oleum can be used in the following reactions:-
The Molecular Mass of Oleum is 178.14
The Density of Oleum is 1.94g/cm3
Purity is approximately 30% which is based on the free SO3 content.
Hazards of Oleum
http://www.sulphuric-acid.co.uk/oleum | Saved Friday, November 18th, 2011 - 6:11 AM