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Sulfurous acid
Cas No: 7782-99-2
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Sulfurous acid CAS 7782-99-2
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7782-99-2 Usage

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.

Hazard

Toxic by ingestion and inhalation, strong irritant to tissue.

Reactivity Profile

Colorless, corrosive, moderately toxic liquid. When heated to decomposition SULFUROUS ACID emits toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 1196].

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).

Air & Water Reactions

Soluble in water with release of heat.

General Description

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.

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

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.

Uses

Dental bleach.

Chemical Properties

colourless liquid
InChI:InChI=1/H2O3S/c1-4(2)3/h(H2,1,2,3)

7782-99-2 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
Sigma-Aldrich (247626)  Sulfurdioxidesolution  ACS reagent, ≥6% 7782-99-2 247626-2KG 2,157.48CNY Detail
Sigma-Aldrich (247626)  Sulfurdioxidesolution  ACS reagent, ≥6% 7782-99-2 247626-500G 1,186.38CNY Detail
Sigma-Aldrich (247626)  Sulfurdioxidesolution  ACS reagent, ≥6% 7782-99-2 247626-100G 675.09CNY Detail
Alfa Aesar (33275)  Sulfurous acid, ACS, 6.0% SO2 min    7782-99-2 *4x500ml 3053.0CNY Detail
Alfa Aesar (33275)  Sulfurous acid, ACS, 6.0% SO2 min    7782-99-2 500ml 788.0CNY Detail

7782-99-2SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 16, 2017

Revision Date: Aug 16, 2017

1.Identification

1.1 GHS Product identifier

Product name sulfurous acid

1.2 Other means of identification

Product number -
Other names Sulfur dioxide solution

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:7782-99-2 SDS

7782-99-2Synthetic route

rongalite
149-44-0

rongalite

A

trithioformaldehyde
36069-03-1

trithioformaldehyde

B

sulfur dioxide
7446-09-5

sulfur dioxide

C

Sulfate
14808-79-8

Sulfate

D

sulphurous acid
7782-99-2

sulphurous acid

E

sulfur
7704-34-9

sulfur

Conditions
ConditionsYield
With hydrogenchloride In not given byproducts: H2O, polythionic acids; digesting with HCl-soln.;A n/a
B 82%
C 0%
D n/a
E 82%
With HCl In not given byproducts: H2O, polythionic acids; digesting with HCl-soln.;A n/a
B 82%
C 0%
D n/a
E 82%
7,11b-dihydro-benzo[c]carbazole-1,6a-disulfonic acid

7,11b-dihydro-benzo[c]carbazole-1,6a-disulfonic acid

acid

acid

A

benzo[c]carbazole
205-25-4

benzo[c]carbazole

B

sulphurous acid
7782-99-2

sulphurous acid

hydrogenchloride
7647-01-0

hydrogenchloride

1,2-bis-[6]quinolylamino-ethane-1,2-disulfonic acid

1,2-bis-[6]quinolylamino-ethane-1,2-disulfonic acid

A

6-aminoquinoline
580-15-4

6-aminoquinoline

B

Glyoxal
131543-46-9

Glyoxal

C

sulphurous acid
7782-99-2

sulphurous acid

hydrogenchloride
7647-01-0

hydrogenchloride

7-methoxy-1-methyl-β-carboline-9-sulfonic acid

7-methoxy-1-methyl-β-carboline-9-sulfonic acid

A

harmine
442-51-3

harmine

B

sulphurous acid
7782-99-2

sulphurous acid

4-methyl-quinoline-2-sulfonic acid
103264-22-8

4-methyl-quinoline-2-sulfonic acid

water
7732-18-5

water

A

sulphurous acid
7782-99-2

sulphurous acid

B

2-oxy-4-methyl-quinoline

2-oxy-4-methyl-quinoline

2,5-dichloro-indol-3-one

2,5-dichloro-indol-3-one

water
7732-18-5

water

sodium sulfite

sodium sulfite

A

5-chloroindole 2,3-dione
17630-76-1

5-chloroindole 2,3-dione

B

sulphurous acid
7782-99-2

sulphurous acid

Conditions
ConditionsYield
at 90℃; Kochen der erhaltenen Natriumsalz mit Alkalien und folgenden Ansaeuern;
furan-2,3,5(4H)-trione pyridine (1:1)

furan-2,3,5(4H)-trione pyridine (1:1)

4,4'-diphenyl-2,4,2',4'-tetrahydro-5,5'-disulfanediyl-bis-[1,2,4]triazol-3-one
60172-88-5

4,4'-diphenyl-2,4,2',4'-tetrahydro-5,5'-disulfanediyl-bis-[1,2,4]triazol-3-one

A

sulphurous acid
7782-99-2

sulphurous acid

B

sodium salt of 4-phenyl-3-mercapto-1.2.4-triazolone-(5)

sodium salt of 4-phenyl-3-mercapto-1.2.4-triazolone-(5)

sulfuric acid
7664-93-9

sulfuric acid

N,N-diphenylthiourea
102-08-9

N,N-diphenylthiourea

A

carbonic-acid
463-79-6

carbonic-acid

B

sulphurous acid
7782-99-2

sulphurous acid

C

4-aminobenzene sulfonic acid
121-57-3

4-aminobenzene sulfonic acid

benzenesulfonic acid
98-11-3

benzenesulfonic acid

A

diphenyl sulphone
127-63-9

diphenyl sulphone

B

sulfuric acid
7664-93-9

sulfuric acid

C

sulphurous acid
7782-99-2

sulphurous acid

D

benzene
71-43-2

benzene

Conditions
ConditionsYield
Destillation unter gewoehnlichem Druck;
sulfuric acid
7664-93-9

sulfuric acid

1-hexadecylcarboxylic acid
57-10-3

1-hexadecylcarboxylic acid

A

sulphurous acid
7782-99-2

sulphurous acid

B

carbon monoxide

carbon monoxide

Conditions
ConditionsYield
at 160 - 180℃;
sulfuric acid
7664-93-9

sulfuric acid

isobutyric Acid
79-31-2

isobutyric Acid

A

sulphurous acid
7782-99-2

sulphurous acid

B

carbon monoxide

carbon monoxide

Conditions
ConditionsYield
at 140 - 155℃;
thiourea
17356-08-0

thiourea

alkaline alkali hypochlorite

alkaline alkali hypochlorite

A

sulphurous acid
7782-99-2

sulphurous acid

B

nitrogen

nitrogen

ethanol
64-17-5

ethanol

benzenesulfonyl chloride
1939-99-7

benzenesulfonyl chloride

zinc

zinc

A

dibenzyl sulfone
620-32-6

dibenzyl sulfone

B

benzylsulfinic acid
4403-73-0

benzylsulfinic acid

C

sulphurous acid
7782-99-2

sulphurous acid

D

benzaldehyde
100-52-7

benzaldehyde

4-Methylpentanoic acid
646-07-1

4-Methylpentanoic acid

sulfuric acid
7664-93-9

sulfuric acid

sulphurous acid
7782-99-2

sulphurous acid

Conditions
ConditionsYield
at 170℃;
sulfonal
115-24-2

sulfonal

zinc

zinc

hydrogen

hydrogen

sulphurous acid
7782-99-2

sulphurous acid

Conditions
ConditionsYield
bei der Destillation;
1-carbamimidoyl-3-carbamoyl-triazane-2-sulfonic acid

1-carbamimidoyl-3-carbamoyl-triazane-2-sulfonic acid

diluted natrium carbonate

diluted natrium carbonate

A

N'-carbamimidoyl-triazene-N-carboxylic acid amide

N'-carbamimidoyl-triazene-N-carboxylic acid amide

B

sulphurous acid
7782-99-2

sulphurous acid

1-ethoxycarbonyl-3-carbamimidoyl-triazane-2-sulfonic acid

1-ethoxycarbonyl-3-carbamimidoyl-triazane-2-sulfonic acid

diluted NaOH-solution

diluted NaOH-solution

A

N'-carbamimidoyl-triazene-N-carboxylic acid ethyl ester

N'-carbamimidoyl-triazene-N-carboxylic acid ethyl ester

B

sulphurous acid
7782-99-2

sulphurous acid

thiocarboxamide
115-08-2

thiocarboxamide

sulfuric acid
7664-93-9

sulfuric acid

A

hydrogen sulfide
7783-06-4

hydrogen sulfide

B

sulphurous acid
7782-99-2

sulphurous acid

thionylacetate

thionylacetate

water
7732-18-5

water

A

sulphurous acid
7782-99-2

sulphurous acid

B

acetic acid
64-19-7

acetic acid

2-hydroxy-2-sulfo-propionic acid
40757-83-3

2-hydroxy-2-sulfo-propionic acid

A

sulphurous acid
7782-99-2

sulphurous acid

B

2-oxo-propionic acid
127-17-3

2-oxo-propionic acid

Conditions
ConditionsYield
Equilibrium constant; wss.-aethanol. Loesung vom pH 3,3 bei 20grad;
sodium hydrogensulfite

sodium hydrogensulfite

acetone oxime
127-06-0

acetone oxime

diluted acid

diluted acid

A

sulfuric acid
7664-93-9

sulfuric acid

B

ammonia
7664-41-7

ammonia

C

sulphurous acid
7782-99-2

sulphurous acid

D

acetone
67-64-1

acetone

1-carbamimidoyl-3-carbamoyl-triazane-2-sulfonic acid

1-carbamimidoyl-3-carbamoyl-triazane-2-sulfonic acid

diluted NaOH-solution

diluted NaOH-solution

A

sulphurous acid
7782-99-2

sulphurous acid

B

nitrogen

nitrogen

thiocyanic acid
463-56-9

thiocyanic acid

A

hydrogen cyanide
74-90-8

hydrogen cyanide

B

sulfuric acid
7664-93-9

sulfuric acid

C

sulphurous acid
7782-99-2

sulphurous acid

D

sulfur

sulfur

Conditions
ConditionsYield
Electrolysis;
ethyl-amidosulfurous acid
100850-89-3

ethyl-amidosulfurous acid

water
7732-18-5

water

A

sulfuric acid
7664-93-9

sulfuric acid

B

sulphurous acid
7782-99-2

sulphurous acid

C

ethylamine
75-04-7

ethylamine

D

thiosulfuric acid

thiosulfuric acid

Conditions
ConditionsYield
weitere Produkte: Trithionsaeure, Pentathionsaeure;
hydrogenchloride
7647-01-0

hydrogenchloride

O,O-dimethyl thiosulfite
3566-73-2

O,O-dimethyl thiosulfite

A

hydrogen sulfide
7783-06-4

hydrogen sulfide

B

sulphurous acid
7782-99-2

sulphurous acid

C

sulfur

sulfur

D

thiosulfuric acid

thiosulfuric acid

hydrogenchloride
7647-01-0

hydrogenchloride

2-amino-5-dimethylaminophenylthiosulphonic acid
43035-11-6

2-amino-5-dimethylaminophenylthiosulphonic acid

A

sulfuric acid
7664-93-9

sulfuric acid

B

sulphurous acid
7782-99-2

sulphurous acid

C

2.2'-diamino-5.5'-bis-dimethylamino-diphenyl sulfide

2.2'-diamino-5.5'-bis-dimethylamino-diphenyl sulfide

2-amino-5-dimethylaminophenylthiosulphonic acid
43035-11-6

2-amino-5-dimethylaminophenylthiosulphonic acid

alkali

alkali

A

sulfuric acid
7664-93-9

sulfuric acid

B

sulphurous acid
7782-99-2

sulphurous acid

C

2.2'-diamino-5.5'-bis-dimethylamino-diphenyl sulfide

2.2'-diamino-5.5'-bis-dimethylamino-diphenyl sulfide

Dibenzyl sulfoxide
621-08-9

Dibenzyl sulfoxide

A

dibenzyl disulphide
150-60-7

dibenzyl disulphide

B

sulphurous acid
7782-99-2

sulphurous acid

C

benzaldehyde
100-52-7

benzaldehyde

D

toluene
108-88-3

toluene

Conditions
ConditionsYield
at 210℃;
ethyleneglycol dibenzenesulfonate
116-50-7

ethyleneglycol dibenzenesulfonate

A

sulphurous acid
7782-99-2

sulphurous acid

B

acetaldehyde
75-07-0

acetaldehyde

C

benzenesulfonic acid
98-11-3

benzenesulfonic acid

D

acetylene
74-86-2

acetylene

Conditions
ConditionsYield
at 315℃; man halt dann die Temperatur bei 270grad;
hydrogenchloride
7647-01-0

hydrogenchloride

p-phenetidino-methanesulfonic acid
787485-97-6

p-phenetidino-methanesulfonic acid

A

formaldehyd
50-00-0

formaldehyd

B

sulphurous acid
7782-99-2

sulphurous acid

C

4-Ethoxyaniline
156-43-4

4-Ethoxyaniline

Conditions
ConditionsYield
teils Spaltung;
sodium sulfide

sodium sulfide

sulphurous acid
7782-99-2

sulphurous acid

sodium hydroxide
1310-73-2

sodium hydroxide

A

water
7732-18-5

water

B

sodium thiosulfate

sodium thiosulfate

Conditions
ConditionsYield
In water pure SO2 is introduced into alkaline Na2S soln.;A n/a
B 100%
sulphurous acid
7782-99-2

sulphurous acid

chloric acid
7790-93-4

chloric acid

A

sulfuric acid
7664-93-9

sulfuric acid

B

chlorine dioxide
10049-04-4, 25052-55-5

chlorine dioxide

C

water
7732-18-5

water

Conditions
ConditionsYield
With air; sulfur dioxide In sulfuric acid byproducts: HClO, HCl, Cl2; Holst-process;;A n/a
B 90%
C n/a
sodium sulfide

sodium sulfide

sulphurous acid
7782-99-2

sulphurous acid

A

water
7732-18-5

water

B

sulfur
7704-34-9

sulfur

C

sodium thiosulfate

sodium thiosulfate

Conditions
ConditionsYield
In water pure SO2 is introduced into concd. Na2S soln. at 60°C;;A n/a
B n/a
C 80%
In water at 20°C, aq. SO2 soln., diluted Na2S soln.;
sodium sulfide

sodium sulfide

sulphurous acid
7782-99-2

sulphurous acid

A

sodium hydrogen sulfide

sodium hydrogen sulfide

B

water
7732-18-5

water

C

sodium thiosulfate

sodium thiosulfate

Conditions
ConditionsYield
In water in slightly acidic soln. (litmus); cyclic process;;A n/a
B n/a
C 75%
ammonium hydroxide

ammonium hydroxide

vanadiumtetrachloride
7632-51-1

vanadiumtetrachloride

sulphurous acid
7782-99-2

sulphurous acid

NH4(1+)*3V(3+)*6OH(1-)*2SO4(2-)=NH4V3(OH)6(SO4)2

NH4(1+)*3V(3+)*6OH(1-)*2SO4(2-)=NH4V3(OH)6(SO4)2

Conditions
ConditionsYield
In water VCl4 was added dropwise to ice-cold water, NH4OH and H2SO3 were added and heated in Teflon liner at 200°C for 3 d and cooled at 0.1°C/min to room temp.; product was washed with water and dried in air; elem. anal.;47%
sodium sulfide

sodium sulfide

sulphurous acid
7782-99-2

sulphurous acid

A

hydrogen sulfide
7783-06-4

hydrogen sulfide

B

water
7732-18-5

water

C

sodium thiosulfate

sodium thiosulfate

D

sodium sulfite
7757-83-7

sodium sulfite

Conditions
ConditionsYield
In water a mixt. of 7% SO2 and 93% N2 is introduced into concd. Na2S soln. at 60°C;;A n/a
B n/a
C 46%
D n/a
sodium sulfide

sodium sulfide

sulphurous acid
7782-99-2

sulphurous acid

sodium hydroxide
1310-73-2

sodium hydroxide

A

hydrogen sulfide
7783-06-4

hydrogen sulfide

B

water
7732-18-5

water

C

sodium thiosulfate

sodium thiosulfate

D

sodium sulfite
7757-83-7

sodium sulfite

Conditions
ConditionsYield
In water 7 % SO2;A n/a
B n/a
C 37.5%
D n/a
rubidium hydroxide

rubidium hydroxide

vanadiumtetrachloride
7632-51-1

vanadiumtetrachloride

sulphurous acid
7782-99-2

sulphurous acid

RbV3(OH)6(SO4)2

RbV3(OH)6(SO4)2

Conditions
ConditionsYield
In water VCl4 was added dropwise to ice-cold water, H2SO3, and RbOH were added and heated in Teflon liner at 205°C for 4 d and cooled at 0.1°C/min to room temp.; crystals were filtered, washed with water and dried in air; elem. anal.;34%

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