Sulfurous Acid
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- $30 - $316.65
- 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
11 prices
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Brand
- Chem-Impex
- GFS CHEMICALS
- Sigma-Aldrich
- Thermo Scientific Chemicals
Package
- *4x500ml
- 100G
- 250G
- 500g
- 500ml
- 1KG
- 2kg
- 2.5L
- 4x2.5L
- ManufacturerChem-Impex
- Product number36697
- Product descriptionSulfur dioxide solution ≥6%(AssaybySO2content)
- Packaging100G
- Price$30
- Updated2026-05-19
- Buy
- ManufacturerChem-Impex
- Product number36697
- Product descriptionSulfur dioxide solution ≥6%(AssaybySO2content)
- Packaging250G
- Price$60
- Updated2026-05-19
- Buy
- ManufacturerChem-Impex
- Product number36697
- Product descriptionSulfur dioxide solution ≥6%(AssaybySO2content)
- Packaging1KG
- Price$120
- Updated2026-05-19
- Buy
- ManufacturerGFS CHEMICALS
- Product number71732
- Product descriptionSULFUROUSACID,6%,REAG.
- Packaging2.5L
- Price$80.49
- Updated2021-12-16
- Buy
- ManufacturerGFS CHEMICALS
- Product number71732
- Product descriptionSulfurous Acid, 6%, Reagent (ACS)
- Packaging2.5L
- Price$218.82
- Updated2026-06-03
- 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%
- Packaging2kg
- Price$290
- Updated2026-04-30
- Buy
- ManufacturerSigma-Aldrich
- Product number247626
- Product descriptionSulfur dioxide solution ACS reagent, ≥6%
- Packaging500g
- Price$157
- Updated2026-04-30
- Buy
- ManufacturerSigma-Aldrich
- Product number247626
- Product descriptionSulfur dioxide solution ACS reagent, ≥6%
- Packaging100g
- Price$88.9
- Updated2026-04-30
- Buy
- ManufacturerThermo Scientific Chemicals
- Product number033275
- Product descriptionSulfurous acid, ACS 6.0% SO2 min
- Packaging*4x500ml
- Price$316.65
- Updated2026-04-24
- Buy
- ManufacturerThermo Scientific Chemicals
- Product number033275
- Product descriptionSulfurous acid, ACS 6.0% SO2 min
- Packaging500ml
- Price$81.65
- Updated2026-04-24
- Buy
| Manufacturer | Product number | Product description | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|
| Chem-Impex | 36697 | Sulfur dioxide solution ≥6%(AssaybySO2content) | 100G | $30 | 2026-05-19 | Buy |
| Chem-Impex | 36697 | Sulfur dioxide solution ≥6%(AssaybySO2content) | 250G | $60 | 2026-05-19 | Buy |
| Chem-Impex | 36697 | Sulfur dioxide solution ≥6%(AssaybySO2content) | 1KG | $120 | 2026-05-19 | Buy |
| GFS CHEMICALS | 71732 | SULFUROUSACID,6%,REAG. | 2.5L | $80.49 | 2021-12-16 | Buy |
| GFS CHEMICALS | 71732 | Sulfurous Acid, 6%, Reagent (ACS) | 2.5L | $218.82 | 2026-06-03 | Buy |
| GFS CHEMICALS | 71736 | SULFUROUSACID,6%,REAG. | 4x2.5L | $241.42 | 2021-12-16 | Buy |
| Sigma-Aldrich | 247626 | Sulfur dioxide solution ACS reagent, ≥6% | 2kg | $290 | 2026-04-30 | Buy |
| Sigma-Aldrich | 247626 | Sulfur dioxide solution ACS reagent, ≥6% | 500g | $157 | 2026-04-30 | Buy |
| Sigma-Aldrich | 247626 | Sulfur dioxide solution ACS reagent, ≥6% | 100g | $88.9 | 2026-04-30 | Buy |
| Thermo Scientific Chemicals | 033275 | Sulfurous acid, ACS 6.0% SO2 min | *4x500ml | $316.65 | 2026-04-24 | Buy |
| Thermo Scientific Chemicals | 033275 | Sulfurous acid, ACS 6.0% SO2 min | 500ml | $81.65 | 2026-04-24 | 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.
InChI :1S/H2O3S/c1-4(2)3/h(H2,1,2,3)
InChIKey :LSNNMFCWUKXFEE-UHFFFAOYSA-N
SMILES :OS(O)=O
LogP :-1.579 (est)
CAS DataBase Reference :7782-99-2(CAS DataBase Reference)
EPA Substance Registry System :Sulfurous acid (7782-99-2)
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.
InChI :1S/H2O3S/c1-4(2)3/h(H2,1,2,3)
InChIKey :LSNNMFCWUKXFEE-UHFFFAOYSA-N
SMILES :OS(O)=O
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): |
 
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| Signal word: | Danger | ||||||||||||||||||||||||||||||
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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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