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About This Item
Linear Formula:
H2SO4 · (SO3)x
CAS Number:
Molecular Weight:
98.08
Beilstein:
2037554
MDL number:
UNSPSC Code:
12352106
PubChem Substance ID:
NACRES:
NA.21
grade
reagent grade
Quality Level
vapor density
3 (vs air)
vapor pressure
2 mmHg ( 25 °C)
form
liquid
concentration
20% (free SO3)
density
1.925 g/mL at 25 °C (lit.)
SMILES string
O=S(=O)=O.OS(O)(=O)=O
InChI
1S/H2O4S.O3S/c1-5(2,3)4;1-4(2)3/h(H2,1,2,3,4);
InChI key
HIFJUMGIHIZEPX-UHFFFAOYSA-N
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General description
Fuming sulfuric acid is an inorganic acid, that can be produced by the addition of sulfur trioxide to concentrated sulfuric acid. It is commonly used as a sulfonating reagent in sulfonation reactions. When fuming sulfuric acid is employed as reaction medium, bromination takes place only in the pyridine nucleus of isomeric methylpyridines and 2,6-dimethylpyridine. It can also oxidize fullerene C60 to form fullerene polymers.
Application
Fuming sulfuric acid may be used as a sulfonating agent for the synthesis of:
- sulfonated poly(1,4-phenylene sulfide)
- water-soluble polyphosphazene polyelectrolyte
- sulfated graphene
Signal Word
Danger
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 2 Inhalation - Skin Corr. 1A - STOT SE 3
Target Organs
Respiratory system
Supplementary Hazards
Storage Class Code
6.1A - Combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials
WGK
WGK 1
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
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