Schwefligesure

Bezeichnung:Schwefligesure

CAS-Nr7782-99-2

Englisch Name:Sulfurous Acid

CBNumberCB6160852

SummenformelH2O3S

Molgewicht82.08

MOL-Datei7782-99-2.mol

Synonyma

Schwefligesure

Schwefligesure physikalisch-chemischer Eigenschaften

Dichte	1.03 g/mL at 25 °C(lit.)
Dampfdichte	2.3 (vs air)
Löslichkeit	solution of SO2 in H2O
pka	1.92(at 25℃)
Aggregatzustand	Liquid
Farbe	Colorless
PH	pKa1= 1.658, pKa2 = 6.820(25℃)
Wasserlöslichkeit	Miscible with water.
Sensitive	Air Sensitive
Merck	14,8976
Dielectric constant	15.6（0℃）
Stabilität	Stable. Incompatible with strong bases.
InChIKey	LSNNMFCWUKXFEE-UHFFFAOYSA-N
LogP	-1.579 (est)
CAS Datenbank	7782-99-2(CAS DataBase Reference)
EPA chemische Informationen	Sulfurous acid (7782-99-2)

Sicherheit

Kennzeichnung gefährlicher	C,Xn
R-Sätze:	20-34-36/38
S-Sätze:	26-36/37/39-45
RIDADR	UN 1833 8/PG 2
WGK Germany	1
RTECS-Nr.	WT2775000
F	10-23
TSCA	Yes
HazardClass	8
PackingGroup	II
HS Code	28111990

Gefahreninformationscode (GHS)

Sulfurous Acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R20:Gesundheitsschädlich beim Einatmen.
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
Beschreibung
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).
Chemische Eigenschaften
colourless liquid
Chemische Eigenschaften
SULFUROUS ACID, colorless liquid, prepared by dissolving SO2 in H2O. Reagent grade H2SO3 contains approximately 6% SO2 in solution
Verwenden
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.”
Verwenden
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.
Verwenden
Dental bleach.
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.
Allgemeine Beschreibung
Sulfurous acid, H2S03, is an unstable, water-soluble, colorless liquid with a pungent burning sulfur odor. Corrosive to metals and tissue. It is derived from absorption of sulfur dioxide( S02) in water.Reagent grade sulfurous acid contains about 6% sulfur dioxide in solution. Sulfurous acid is a strong reducing agent.It is readily oxidized to sulfuric acid and is itself reduced to hydrogen sulfide by zinc and dilute sulfuric acid. Sulfurous acid is used in the synthesis of medicines and chemicals, in the manufacture of paper and wine, in brewing, in metallurgy, in ore flotation, as a bleach and analytical reagent, and for refining of petroleum products.
Air & Water Reaktionen
Soluble in water with release of heat.
Reaktivität anzeigen
Colorless, corrosive, moderately toxic liquid. When heated to decomposition SULFUROUS ACID emits toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 1196].
Hazard
Toxic by ingestion and inhalation, strong irritant to tissue.
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.
Brandgefahr
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.
Industrielle Verwendung
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.
Sicherheitsprofil
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.
Einzelnachweise
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

Sulfurous Acid Upstream-Materialien And Downstream Produkte

Schwefligesure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7782-99-2, Sulfurous Acid Verwandte Suche:

Send Inquriy