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435597

Sulfuric acid, fuming

reagent grade, 20%, as free SO3

Synonym(s):

Oleum

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About This Item

Linear Formula:
H2SO4 · (SO3)x
CAS Number:
8014-95-7
Molecular Weight:
98.08
UNSPSC Code:
12352106
NACRES:
NA.21
PubChem Substance ID:
329756351
MDL number:
MFCD00137792
Beilstein/REAXYS Number:
2037554
Concentration:
20% (free SO3)
Form:
liquid
Grade:
reagent grade
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grade

reagent grade

Quality Level

100

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

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

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pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

Hazard Classifications

Acute Tox. 2 Inhalation - Skin Corr. 1A - STOT SE 3

target_organs

Respiratory system

supp_hazards

EUH014

Storage Class

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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

Substances Subject to be Indicated Names

ishl_indicated

Substances Subject to be Notified Names

ishl_notified

435597-500G:4.548173149974E12

jan

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Certificates of Analysis (COA)

Lot/Batch Number
BCCP6686
BCCP0982
SHBT1854
SHBT1239
BCCN4287

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Daley RF and Daley SJ.
Organic Chemistry, Part 3 of 3, 801-801 null
Sulfated graphene as an efficient solid catalyst for acid-catalyzed liquid reactions.
Liu F, et al.
Journal of Materials Chemistry, 22(12), 5495-5502 (2012)
Bromination of methylpyridines in fuming sulfuric acid.
Van der Does L and Hertog HJD.
Rec. Trav. Chim., 84(7), 951-964 (1965)
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