Fluorosulfonic acid , purifiedbytriple-distillation , 7789-21-1

Synonym(s):
Fluosulfuric acid

CAS NO.：7789-21-1

Empirical Formula: FHO3S

Molecular Weight: 100.07

MDL number: MFCD00066174

EINECS: 232-149-4

Update time: 2022-07-08

PRODUCT Properties

Melting point:	−87.3 °C(lit.)
Boiling point:	165.5 °C(lit.)
Density	1.726 g/mL at 25 °C(lit.)
vapor density	3.5 (vs air)
vapor pressure	2.5 mm Hg ( 25 °C)
storage temp.	2-8°C
solubility	reacts with H2O
pka	-6.29±0.15(Predicted)
form	colorless liquid
color	colorless
Water Solubility	hydrolyzes violently in H2O; reddish?brown color in acetone [MER06]
Merck	13,4206
Stability:	Stable. May corrode glass. Incompatible with many metals, bases.
CAS DataBase Reference	7789-21-1(CAS DataBase Reference)
EPA Substance Registry System	Fluorosulfuric acid (7789-21-1)

Description and Uses

Fluorosulphuric acid (FSO3H) is a free-flowing colourless fuming liquid. It is soluble in polar organic solvents such as acetic acid, ethyl acetate, and nitrobenzene but poorly soluble in nonpolar solvents such as alkanes. FSO3H is corrosive to metals and body tissues, corrodes glass, and is incompatible with many metals and bases. With its strong acidity, FSO3H dissolves almost all organic compounds that are even weak proton acceptors. FSO3H hydrolyses slowly to HF and sulphuric acid (H2SO4). The related triflic acid (CF3SO3H) retains the high acidity of FSO3H but is more hydrolytically stable. FSO3H is one of the strongest known simple Bronsted acids. FSO3H is useful for regenerating mixtures of HF and H2SO4 for etching lead glass. FSO3H isomerises alkanes and the alkylation of hydrocarbons with alkenes, although it is unclear if such applications are of commercial importance. FSO3H is used as a catalyst in organic synthesis and in electroplating and as a fluorinating agent and as a laboratory fluorinating agent. FSO3H has been reported as a highly toxic and corrosive chemical substance. FSO3H is non-combustible but enhances combustion of other substances. It gives off irritating or toxic fumes (or gases) in a fire. FSO3H hydrolyses to release HF. Addition of water to FSO3H causes very violent reactions similar to the addition of water to H2SO4. Addition of FSO3H to water is a much more violent process than addition of H2SO4. The combination of FSO3H and others is categorised as ‘magic acids and super acids’. Very short contact and the fumes of FSO3H cause severe painful burns.

Catalyst in organic synthesis, electropolishing, fluorinating agent.

Safety

Symbol(GHS)	GHS05,GHS07
Signal word	Danger
Hazard statements	H314-H332
Precautionary statements	P261-P271-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
Hazard Codes	C,T
Risk Statements	20-35
Safety Statements	26-45
RIDADR	UN 1777 8/PG 1
WGK Germany	1
RTECS	LP0715000
Hazard Note	Corrosive/Toxic
HazardClass	8
PackingGroup	I
Hazardous Substances Data	7789-21-1(Hazardous Substances Data)