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Sulfurous Acid

Product NameSulfurous Acid

CAS7782-99-2

MFH2O3S

MW82.08

EINECS231-973-1

MOL File7782-99-2.mol

Chemical Properties

Density  1.03 g/mL at 25 °C(lit.)
vapor density  2.3 (vs air)
form  Liquid
pka 1.92(at 25℃)
color  Colorless
Water Solubility  Miscible with water.
Sensitive  Air Sensitive
Merck  14,8976
Stability Stable. Incompatible with strong bases.
InChIKey LSNNMFCWUKXFEE-UHFFFAOYSA-N
CAS DataBase Reference 7782-99-2(CAS DataBase Reference)
EPA Substance Registry System Sulfurous acid (7782-99-2)

Sulfurous Acid is a weak and unstable inorganic acid, which is considered an aqueous solution of sulfur dioxide in water. It is formed theoretically by burning sulfur to produce sulfur dioxide, which is then reacted with water. However, there is no evidence that sulfurous acid exists in solution, while the molecules of which has been detected in the gas phase, since the reaction is reversible and the acid readily decomposes back into the reactants. Sulfurous acid is not usually available in its acid form, but more commonly prepared as its sodium or potassium salts.

Safety Information

Hazard Codes  C,Xn
Risk Statements  20-34-36/38
Safety Statements  26-36/37/39-45
RIDADR  UN 1833 8/PG 2
WGK Germany  1
RTECS  WT2775000
10-23
TSCA  Yes
HazardClass  8
PackingGroup  II
HS Code  28111990

MSDS

Usage And Synthesis

Sulfurous Acid Supplier