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ChemicalBook >> CAS DataBase List >> Sulfurous Acid

Sulfurous Acid

Sulfurous Acid price.
  • $80.2 - $317
  • Product name: Sulfurous Acid
  • CAS: 7782-99-2
  • MF: H2O3S
  • MW: 82.08
  • EINECS:231-973-1
  • MDL Number:MFCD00011335
  • Synonyms:schwefligesaure ;sulfurdioxidesolution ;Sulfurous anhydride solution;Sulfurous acid, 6.0% SO;SULFUROUS ACID;SULFUROUS ACID SOLUTION;SULFUROUS ACID, 6% REAGENT (ACS);SULFUROUS ACID A.C.S. REAGENT
7 prices
Selected condition：
Brand
  • Alfa Aesar
  • GFS CHEMICALS
  • Sigma-Aldrich
Package
  • 100g
  • 500ml
  • 500g
  • 2kg
  • 4x2.5L
  • *4x500ml
  • 2.5L
  • ManufacturerAlfa Aesar
  • Product number033275
  • Product descriptionSulfurous acid, ACS 6.0% SO2 min
  • Packaging500ml
  • Price$86.1
  • Updated2024-03-01
  • Buy
  • ManufacturerAlfa Aesar
  • Product number033275
  • Product descriptionSulfurous acid, ACS 6.0% SO2 min
  • Packaging*4x500ml
  • Price$317
  • Updated2024-03-01
  • Buy
  • ManufacturerGFS CHEMICALS
  • Product number71732
  • Product descriptionSULFUROUSACID,6%,REAG.
  • Packaging2.5L
  • Price$80.49
  • Updated2021-12-16
  • Buy
  • ManufacturerGFS CHEMICALS
  • Product number71736
  • Product descriptionSULFUROUSACID,6%,REAG.
  • Packaging4x2.5L
  • Price$241.42
  • Updated2021-12-16
  • Buy
  • ManufacturerSigma-Aldrich
  • Product number247626
  • Product descriptionSulfur dioxide solution ACS reagent, ≥6%
  • Packaging100g
  • Price$80.2
  • Updated2024-03-01
  • Buy
  • ManufacturerSigma-Aldrich
  • Product number247626
  • Product descriptionSulfur dioxide solution ACS reagent, ≥6%
  • Packaging500g
  • Price$142
  • Updated2024-03-01
  • Buy
  • ManufacturerSigma-Aldrich
  • Product number247626
  • Product descriptionSulfur dioxide solution ACS reagent, ≥6%
  • Packaging2kg
  • Price$262
  • Updated2024-03-01
  • Buy
Manufacturer Product number Product description Packaging Price Updated Buy
Alfa Aesar 033275 Sulfurous acid, ACS 6.0% SO2 min 500ml $86.1 2024-03-01 Buy
Alfa Aesar 033275 Sulfurous acid, ACS 6.0% SO2 min *4x500ml $317 2024-03-01 Buy
GFS CHEMICALS 71732 SULFUROUSACID,6%,REAG. 2.5L $80.49 2021-12-16 Buy
GFS CHEMICALS 71736 SULFUROUSACID,6%,REAG. 4x2.5L $241.42 2021-12-16 Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 100g $80.2 2024-03-01 Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 500g $142 2024-03-01 Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 2kg $262 2024-03-01 Buy

Properties

Density :1.03 g/mL at 25 °C(lit.)
vapor density :2.3 (vs air)
solubility :solution of SO2 in H2O
pka :1.92(at 25℃)
form :Liquid
color :Colorless
PH :pKa1= 1.658, pKa2 = 6.820(25℃)
Water Solubility :Miscible with water.
Sensitive :Air Sensitive
Merck :14,8976
Dielectric constant :15.6（0℃）
Stability :Stable. Incompatible with strong bases.
InChIKey :LSNNMFCWUKXFEE-UHFFFAOYSA-N
LogP :-1.579 (est)
CAS DataBase Reference :7782-99-2(CAS DataBase Reference)
EPA Substance Registry System :Sulfurous acid (7782-99-2)

Safety Information

Symbol(GHS): GHS hazard pictogramsGHS hazard pictograms
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger GHS hazard pictograms P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning GHS hazard pictograms P261, P271, P304+P340, P312
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Description

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.
Sulfurous acid and its salts are commonly applied as powerful reducing agents and disinfectant agents due to its strong reducibility. It is also considered as a mild bleaching agent especially for applications having chlorine sensitive materials. Besides, Sulfurous acid is a food additive listed on the EAFUS food Additive Database (Jan. 2001).

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