247626
Sulfur dioxide solution
ACS reagent, ≥6%
Sinónimos:
Sulfurous acid, Sulfurous anhydride
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Fórmula lineal:
H2SO3
Número CAS:
Peso molecular:
82.08
NACRES:
NB.24
PubChem Substance ID:
UNSPSC Code:
12352300
EC Number:
231-973-1
MDL number:
Assay:
≥6% SO2 basis (by Na2S2O3, titration)
Concentration:
≥6%
Form:
liquid
Grade:
ACS reagent
Servicio técnico
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ACS reagent
Quality Level
vapor density
2.3 (vs air)
assay
≥6% SO2 basis (by Na2S2O3, titration)
form
liquid
concentration
≥6%
ign. residue
≤0.005%
density
1.03 g/mL at 25 °C (lit.)
anion traces
chloride (Cl-): ≤5 ppm
cation traces
Fe: ≤5 ppm, heavy metals (as Pb): ≤2 ppm
SMILES string
OS(O)=O
InChI
1S/H2O3S/c1-4(2)3/h(H2,1,2,3)
InChI key
LSNNMFCWUKXFEE-UHFFFAOYSA-N
General description
Sulfurous acid (H2SO3), a weak diprotic acid, is formed when sulfur dioxide (SO2) dissolves in water. Sulfurous acid is a complex mixture of various hydrates of SO2 and the ions H3O+, S2O52- and HSO3-. The predominant species present in the solution are pH dependent.
Application
Sulfurous acid can be used as a reducing agent in chemical synthesis.
signalword
Danger
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
target_organs
Respiratory system
hcodes
Hazard Classifications
Acute Tox. 4 Inhalation - Eye Dam. 1 - Skin Corr. 1B - STOT SE 1 Inhalation
Clase de almacenamiento
6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
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The thermodynamic ionization constants of sulfurous acid at 25?1.
Tartar HV and Garretson HH.
Journal of the American Chemical Society, 63(3), 808-816 (1941)
M Kharina et al.
Applied biochemistry and biotechnology, 179(2), 307-320 (2016-01-29)
Sulfurous acid was used for pretreatment of sugar beet pulp (SBP) in order to achieve high efficiency of both extraction of carbohydrates and subsequent enzymatic hydrolysis of the remaining solids. The main advantage of sulfurous acid usage as pretreatment agent
Miquel Pascual et al.
Journal of the science of food and agriculture, 95(15), 3067-3076 (2015-07-16)
Rainfed viticulture, mainly in semi-arid environments, is limited by environmental variability, particularly precipitation and its seasonal distribution, and soil water availability, thus ultimately determining the final quality of grape and wine. Studies on the feasibility of practices such as canopy