| Identification | More | [Name]
SULFUROUS ACID | [CAS]
7782-99-2 | [Synonyms]
SULFUR DIOXIDE
SULFUROUS ACID
SULFUROUS ANHYDRIDE
SULPHUR DIOXIDE
SULPHUROUS ACID
schwefligesaure
sulfurdioxidesolution
sulfurous
Sulfur dioxcide solution
SULFUROUS ACID A.C.S. REAGENT
SULFUR DIOXIDE SOLUTION, 5-6% IN WATER
SulfurourAcidH2So3
Sulfurousacid,ACS,6.0%SO2min
SULFUROUS ACID SOLUTION
SULFUROUS ACID, 6% REAGENT (ACS)
sulfurous acid, acs
SULFUROUSACID,REAGENT,ACS
Schweflige Sure
Sulfurous Acid, 6-9%
Sulfurous acid, Sulfurous anhydride | [EINECS(EC#)]
231-973-1 | [Molecular Formula]
H2O3S | [MDL Number]
MFCD00011335 | [Molecular Weight]
82.08 | [MOL File]
7782-99-2.mol |
| Chemical Properties | Back Directory | [Appearance]
colourless liquid | [density ]
1.03 g/mL at 25 °C(lit.)
| [vapor density ]
2.3 (vs air) | [solubility ]
solution of SO2 in H2O | [form ]
Liquid | [pka]
1.92(at 25℃) | [color ]
Colorless | [Stability:]
Stable. Incompatible with strong bases. | [Water Solubility ]
Miscible with water. | [Sensitive ]
Air Sensitive | [Merck ]
14,8976 | [Dielectric constant]
15.6（0℃） | [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 Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R20:Harmful by inhalation.
R34:Causes burns. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
UN 1833 8/PG 2
| [WGK Germany ]
1
| [RTECS ]
WT2775000
| [F ]
10-23 | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
II | [HS Code ]
28111990 | [Safety Profile]
A poison by ingestion and inhalation. A corrosive irritant to skin, eyes, and mucous membranes. Human systemic effects by ingestion: nausea or vomiting, hypermotility, diarrhea, and othergastrointestinal effects. When heated to decomposition it emits highly toxic fumes ofSOx. |
| Hazard Information | Back Directory | [General Description]
A colorless liquid with a pungent burning sulfur odor. Corrosive to metals and tissue. | [Reactivity Profile]
Colorless, corrosive, moderately toxic liquid. When heated to decomposition SULFUROUS ACID(7782-99-2) emits toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 1196]. | [Air & Water Reactions]
Soluble in water with release of heat. | [Health Hazard]
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. | [Fire Hazard]
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. | [Chemical Properties]
colourless liquid | [Chemical Properties]
SULFUROUS ACID, colorless liquid, prepared by dissolving SO2 in H2O. Reagent grade H2SO3 contains approximately 6% SO2 in solution | [Uses]
As a bleaching agent, sulfurous acid is used for whitening wool, silk, feathers, sponge, straw, wood, and other natural products. In some areas, its use is permitted for bleaching and preserving dried fruits. The salts of sulfurous acid are sulfites. | [Uses]
Dental bleach. | [Uses]
Sulfurous acid (H2SO3) can be produced by burning sulfur to form sulfur dioxide (SO2) gas
and by then dissolving the gas in water to form sulfurous acid. This is the acid produced by
burning coal that has a high sulfur content; the gaseous sulfur dioxide by-product of combustion
then combines with atmospheric water to form “acid rain.” | [Definition]
A weak acid found only in
solution, made by passing sulfur(IV) oxide
into water. The solution is unstable and
smells of sulfur(IV) oxide. It is a reducing
agent, converting iron(III) ions to iron(II)
ions, chlorine to chloride ions, and orange dichromate(VI) ions to green chromium(III) ions. | [Hazard]
Toxic by ingestion and inhalation, strong
irritant to tissue. | [Industrial uses]
Sulfurous acid (H2SO3) is usually marketed as liquid SO2. The bulk of SO2 is produced
from off-smelter gases. Although handling of SO2 liquid requires special
equipment, it is frequently used as a pH regulator and depressant, primarily during
the treatment of complex sulfide ores. SO2 is largely used in North American operations
as a pyrite depressant and for the depression of galena during copper/lead
separation. |
| Questions and Answers (Q&A) | Back Directory | [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). | [References]
https://en.wikipedia.org/wiki/Sulfurous_acid
http://printwiki.org/Sulfurous_Acid
http://www.softschools.com/formulas/chemistry/sulfurous_acid_uses_properties_structure_formula/242/
https://pubchem.ncbi.nlm.nih.gov/compound/Sulfurous_acid#section=Top
http://www.chemistrylearner.com/sulfurous-acid.html |
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