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ChemicalBook--->CAS DataBase List--->7783-05-3

7783-05-3

7783-05-3 Structure

7783-05-3 Structure
IdentificationBack Directory
[Name]

pyrosulfuric acid
[CAS]

7783-05-3
[Synonyms]

Disulfuric acid
[Molecular Formula]

H2O7S2
[MOL File]

7783-05-3.mol
[Molecular Weight]

178.14
Chemical PropertiesBack Directory
[Melting point ]

35°
[density ]

1.89
[EPA Substance Registry System]

Disulfuric acid (7783-05-3)
Safety DataBack Directory
[Symbol(GHS) ]


GHS07,GHS05
[Signal word ]

Danger
[Hazard statements ]

H335-H314
[Precautionary statements ]

P260-P264-P280-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P321-P305+P351+P338-P405-P501
Hazard InformationBack Directory
[Description]

Disulfuric acid has the molecular formula of H2S2O7 where the S-atom is in the+5 oxidation state. It is a major constituent of fuming sulfuric acid (also known as “oleum”) described by the formula ySO3·H2O where y is the total molar sulfur trioxide content. They can also be described by the formula: H2SO4·xSO3, which are also minor constituents of liquid anhydrous sulfuric acid due to the equilibria:
H2O+SO3→H2SO4+SO3→H2S2O7
Thus, the disulfuric acid is prepared by reacting excess SO3 with sulfuric acid:
H2SO4+SO3→H2S2O7
Disulfuric acid is a strong acid and protonates sulfuric acid in the (anhydrous) sulfuric acid solvent system. An alternative IUPAC name is (sulfo-oxy)sulfonic acid.
[Definition]

ChEBI: Disulfuric acid is a sulfur oxoacid.
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Tags:7783-05-3 Related Product Information
21109-95-5 12032-36-9 20548-54-3 13686-28-7 8014-95-7 1314-96-1 7783-06-4

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