Product Name

  • Name

    peroxomonosulphuric acid

  • EINECS
  • CAS No. 7722-86-3
  • Article Data82
  • CAS DataBase
  • Density 2.239g/cm3
  • Solubility
  • Melting Point 45, decomposing [HAW93]
  • Formula H2O5S
  • Boiling Point
  • Molecular Weight 114.079
  • Flash Point
  • Transport Information
  • Appearance
  • Safety Strong irritant. Powerful oxidizer. An explosive. Explosive reaction acetone; alcohols; aromatics (e.g., aniline; benzene; phenol); platinum; manganese dioxide; silver. Incompatible with acetone; catalysts; fibers. When heated to decomposition it emits toxic fumes of SOx. See also PEROXIDES, INORGANIC; PEROXIDES, ORGANIC.
  • Risk Codes
  • Molecular Structure Molecular Structure of 7722-86-3 (peroxomonosulphuric acid)
  • Hazard Symbols
  • Synonyms Peroxomonosulphuric acid;
  • PSA 79.44000
  • LogP 0.13700

Synthetic route

chlorosulfonic acid
7790-94-5

chlorosulfonic acid

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
in traces H2O2, Cl2, H2S2O8;96.6%
in traces H2O2, Cl2, H2S2O8;96.6%
sulfuric acid monohydrate
50981-12-9, 10193-30-3

sulfuric acid monohydrate

ammonium sulfate-hydrogen peroxide(1/1)

ammonium sulfate-hydrogen peroxide(1/1)

A

caro's acid
7722-86-3

caro's acid

B

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

C

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
without water, -10°C;A 93.5%
B 1.4%
C 5.1%
without water, -10°C;A 93.5%
B 1.4%
C 5.1%
sulfur trioxide
7446-11-9

sulfur trioxide

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With H2SO4 In neat (no solvent) 87.3% H2O2 added to 65% oleum at 0-10°C within 1 h; crystals isolated by slow cooling to -20°C for 24 h;62.9%
In neat (no solvent) reaction with anhydrous H2O2, cooling;;
under heat evolution, in water proof condition forming very little product;
In water -5°C;
sulphurous acid
7782-99-2

sulphurous acid

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
With ozone In waterA n/a
B 1%
With ozone In waterA n/a
B 1%
With ozone ozonisated H2SO3 soln.;A n/a
B <1
With ozone ozonisated H2SO3 soln.;A n/a
B <1
sulfur trioxide
7446-11-9

sulfur trioxide

water
7732-18-5

water

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

A

caro's acid
7722-86-3

caro's acid

B

sulfuric acid
7664-93-9

sulfuric acid

C

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
at 13 - 15℃; for 5.5 - 7h;
sulfuric acid
7664-93-9

sulfuric acid

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
In water Kinetics; byproducts: H2O; slow addn. of H2O2 to H2SO4 soln.; react. carried out in temp. range 283-323 K, thermostated; titrimetry;
In not given concd. H2SO4;
In water at 2 - 8℃; for 3.5h; Product distribution / selectivity;
at 92℃; Product distribution / selectivity; Cooling;
In not given concd. H2SO4;
dihydrogen peroxide
7722-84-1

dihydrogen peroxide

Marshall's acid
13445-49-3

Marshall's acid

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
In neat (no solvent) cooling;;
>98.5
>98.5
sulfur trioxide
7446-11-9

sulfur trioxide

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

A

caro's acid
7722-86-3

caro's acid

B

sulfuric acid
7664-93-9

sulfuric acid

Conditions
ConditionsYield
In sulfuric acid addition of H2O2 (100%) to oleum;;
sulfuric acid
7664-93-9

sulfuric acid

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With ozone In water<1
In water Electrolysis; anodic process;
In not given
With O3 In water<1
sulfuric acid
7664-93-9

sulfuric acid

A

caro's acid
7722-86-3

caro's acid

B

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

C

oxygen
80937-33-3

oxygen

D

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In water Electrolysis; glow discharge electrolysis by alternating current; mechanismus discussed;
In water Electrolysis; glow discharge electrolysis by alternating current; 12°C; C(val) H2SO4 = 1-10; 50 Hz; current density 0.04 A/cm2; p = 11 torr;
In water Electrolysis; glow discharge electrolysis by alternating current; 12°C; C(val) H2SO4 = 1-10; 50 Hz; current density 0.04 A/cm2; p = 11 torr;
In water Electrolysis; glow discharge electrolysis by alternating current; mechanismus discussed;
In water Electrolysis; glow discharge electrolysis by alternating current; mechanismus discussed;
sulfuric acid
7664-93-9

sulfuric acid

A

caro's acid
7722-86-3

caro's acid

B

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

C

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In water Electrolysis; glow discharge electrolysis; 10°C; C(val) H2SO4 = 0.5-4 as well as 36% H2SO4;
In water Electrolysis; glow discharge electrolysis; ambient temp. and -50°C; 11-55 % H2SO4 ; 13 torr;
Electrolysis; anod in gas-filled room, alternating or continuous current, glow discharge;
dihydrogen peroxide
7722-84-1

dihydrogen peroxide

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With sulfuric acid In not given cooling;;
With sulfuric acid In water byproducts: H2O;
With sulfuric acid In not given byproducts: H2O;
chlorosulfonic acid
7790-94-5

chlorosulfonic acid

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In not given slow addition of H2O2 to HOSO2Cl, cooling; ratio of products depending on amount of used H2O2;;
In not given
In not given
Marshall's acid
13445-49-3

Marshall's acid

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With dihydrogen peroxide In neat (no solvent) product crystallises;
With HNO3 hydrolysis;
With H2O2 In neat (no solvent) product crystallises;
Marshall's acid
13445-49-3

Marshall's acid

A

caro's acid
7722-86-3

caro's acid

B

sulfuric acid
7664-93-9

sulfuric acid

Conditions
ConditionsYield
With water In not given byproducts: H2O2;
In water during storage of H2SO4 solns. having been previously electrolysed;
With H2O In not given byproducts: H2O2;
water
7732-18-5

water

Marshall's acid
13445-49-3

Marshall's acid

A

caro's acid
7722-86-3

caro's acid

B

sulfuric acid
7664-93-9

sulfuric acid

Conditions
ConditionsYield
hydrolysis;
hydrolysis;
sulfuric acid
7664-93-9

sulfuric acid

Marshall's acid
13445-49-3

Marshall's acid

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
hydrolysis, faster with concd. than with dild. H2SO4;
40% H2SO4;>99
sulfuric acid
7664-93-9

sulfuric acid

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In not givenA 0%
B 0%
dipotassium peroxodisulfate

dipotassium peroxodisulfate

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With sulfuric acid concd. H2SO4;
With H2SO4 concd. H2SO4;
dipotassium peroxodisulfate

dipotassium peroxodisulfate

A

caro's acid
7722-86-3

caro's acid

B

sulfuric acid
7664-93-9

sulfuric acid

Conditions
ConditionsYield
With water In sulfuric acid byproducts: H2O2; effect of H2SO4 concn. on the H2O2/H2SO5 ratio;
dipotassium peroxodisulfate

dipotassium peroxodisulfate

A

potassium hydrogensulfate
7646-93-7

potassium hydrogensulfate

B

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With sulfuric acid; water In water Kinetics; byproducts: O2; with over 15% H2SO4 ; at 98 °C;
With H2SO4; H2O In water Kinetics; byproducts: O2; with over 15% H2SO4 ; at 98 °C;
sulfur tetroxide

sulfur tetroxide

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With water In water no hydrolysis; evidence by a number of reacts., which do not take place;;0%
sulfuric acid
7664-93-9

sulfuric acid

sulfur trioxide
7446-11-9

sulfur trioxide

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In neat (no solvent) reaction by influence of a O3-O2 mixture on fuming H2SO4 (with a content of free SO3 between 38.21-76.59%);;
In neat (no solvent) reaction by influence of a O3-O2 mixture on fuming H2SO4 (with a content of free SO3 between 38.21-76.59%);;
ammonium sulfate-hydrogen peroxide(1/1)

ammonium sulfate-hydrogen peroxide(1/1)

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
With sulfuric acid
ammonium sulfate-hydrogen peroxide(1/1)

ammonium sulfate-hydrogen peroxide(1/1)

sulfuric acid
7664-93-9

sulfuric acid

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In not given -10°C; with the exclusion of water;A n/a
B >99
In not given -10°C; with the exclusion of water;A n/a
B >99
barium peroxodisulfate

barium peroxodisulfate

A

barium sulfate

barium sulfate

B

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
Ba-peroxodisulfat /containing crystal water/ standing for a week;
hydrogensulfate
14996-02-2

hydrogensulfate

A

caro's acid
7722-86-3

caro's acid

B

fluorosulphonic acid
7789-21-1

fluorosulphonic acid

C

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
With water; fluorine In water
sulfuric acid
7664-93-9

sulfuric acid

A

caro's acid
7722-86-3

caro's acid

B

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
In water Kinetics; Electrolysis; effect of electrol. duration discussed; 14.1 n-H2SO4; 7°C; 0.75 A/cm2; Pt anod;
With ozone In not given fuming H2SO4;
In water Kinetics; Electrolysis; 15 n-H2SO4; 30 A/dm2;
sodium peroxide

sodium peroxide

sulfuric acid
7664-93-9

sulfuric acid

caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
byproducts: ozone; under cooling, concd. H2SO4;
byproducts: ozone; under cooling, concd. H2SO4;
caro's acid
7722-86-3

caro's acid

4-[2-(phenylthio)ethyl]-1,2-diphenyl-3,5-pyrazolidinedione
3736-92-3

4-[2-(phenylthio)ethyl]-1,2-diphenyl-3,5-pyrazolidinedione

4-[2-(phenylsulfinyl)ethyl]-1,2-diphenyl-3,5-pyrazolidinedione
57-96-5

4-[2-(phenylsulfinyl)ethyl]-1,2-diphenyl-3,5-pyrazolidinedione

Conditions
ConditionsYield
With sodium hydrogencarbonate; sodium hydrogensulfite In water; acetic acid; ethyl acetate; toluene60%
caro's acid
7722-86-3

caro's acid

Marshall's acid
13445-49-3

Marshall's acid

Conditions
ConditionsYield
decompn. during storage (8 days);15.3%
With chlorosulfonic acid
With HSO3Cl
caro's acid
7722-86-3

caro's acid

potassium carbonate
584-08-7

potassium carbonate

PMPS triple salt

PMPS triple salt

Conditions
ConditionsYield
In water at 11 - 17℃; for 0.3h; Product distribution / selectivity;
caro's acid
7722-86-3

caro's acid

potassium carbonate
584-08-7

potassium carbonate

PMPS triple salt

PMPS triple salt

Conditions
ConditionsYield
In water
caro's acid
7722-86-3

caro's acid

fluoromalonaldehyde bis(diethyl acetal)
120131-05-7

fluoromalonaldehyde bis(diethyl acetal)

fluoromalonic acid diethyl ester
685-88-1

fluoromalonic acid diethyl ester

Conditions
ConditionsYield
With ammonium persulfate; sulfuric acid In ethanol; water
caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
In not given reaction by let standing of 92% concd. H2SO5 soln. shortly above 0 °C;; not isolated, detection by odor;;
In sulfuric acid decompn.;
In neat (no solvent) spontaneous decompn.;;
caro's acid
7722-86-3

caro's acid

hydrogen bromide
10035-10-6, 12258-64-9

hydrogen bromide

bromine
7726-95-6

bromine

caro's acid
7722-86-3

caro's acid

manganese(II)

manganese(II)

manganese(III) ion

manganese(III) ion

caro's acid
7722-86-3

caro's acid

sulfuric acid
7664-93-9

sulfuric acid

Conditions
ConditionsYield
With sulfur In sulfuric acid
With sulfur dioxide; water In water
caro's acid
7722-86-3

caro's acid

A

sulfuric acid
7664-93-9

sulfuric acid

B

oxygen
80937-33-3

oxygen

caro's acid
7722-86-3

caro's acid

A

sulfuric acid
7664-93-9

sulfuric acid

B

dihydrogen peroxide
7722-84-1

dihydrogen peroxide

Conditions
ConditionsYield
With water In sulfuric acid hydrolysis faster in highe concn.;
With H2O hydrolysis;
caro's acid
7722-86-3

caro's acid

oxygen
80937-33-3

oxygen

Conditions
ConditionsYield
Irradiation (UV/VIS); blue light; 98.6°C, decomp. in 24 h;
platinum in presence of H2O2 faster than alone or H2O2 without Pt;
With potassium permanganate
caro's acid
7722-86-3

caro's acid

Conditions
ConditionsYield
With KOH In ethanol
caro's acid
7722-86-3

caro's acid

hydroxyperoxide
29683-94-1

hydroxyperoxide

Conditions
ConditionsYield
In sulfuric acid aq. sulfuric acidic soln. of Caro's acid;;0%
In sulfuric acid aq. sulfuric acidic soln. of Caro's acid;;
In sulfuric acid aq. H2SO4; aq. sulfuric acidic soln. of Caro's acid;;0%
In sulfuric acid aq. H2SO4; aq. sulfuric acidic soln. of Caro's acid;;
caro's acid
7722-86-3

caro's acid

carbon dioxide
124-38-9

carbon dioxide

Conditions
ConditionsYield
With pyrographite In sulfuric acid pulverised charcoal, heating;
With charcoal In sulfuric acid pulverised charcoal, heating;
caro's acid
7722-86-3

caro's acid

ammonium chloride

ammonium chloride

A

hydrogenchloride
7647-01-0

hydrogenchloride

B

hydroxyl,ammonium,sulphate
52900-28-4

hydroxyl,ammonium,sulphate

Peroxymonosulfuric Acid Chemical Properties

Chemistry informtion about Peroxymonosulfuric Acid (CAS NO.7722-86-3) is:
IUPAC Name: Tetraoxathiolane 5,5-Dioxide
Synonyms: Peroxomonosulphuric Acid ; Peroxysulfuric Acid ; Persulfuric Acid ; Sulfomonoperacid ; Peroxymonosulfuric Acid ; Caro Acid ; Peroxosulfuric Acid
MF: O6S
MW: 128.0614
EINECS: 231-766-6 
Density: 1.7-1.8 g/cm3
Following is the molecular structure of Peroxymonosulfuric Acid (CAS NO.7722-86-3) is:

Peroxymonosulfuric Acid History

 Peroxymonosulfuric Acid was first described by Heinrich Caro, after whom it is named.

Peroxymonosulfuric Acid Uses

 Peroxymonosulfuric Acid (CAS NO.7722-86-3) has been used for a variety of disinfectant and cleaning applications, e.g., swimming pool treatment and denture cleaning. Alkali metal salts of H2SO5 show promise for the delignification of wood. Ammonium, sodium, and potassium salts of Peroxymonosulfuric Acid are used in the plastics industry as polymerization initiators, etchants, desizing agents, soil conditioner, and for decolorizing and deodorizing oils. Potassium peroxymonosulfate, KHSO5, is the potassium acid salt of peroxymonosulfuric acid. It is widely used as an oxidizing agent.

Peroxymonosulfuric Acid Safety Profile

Strong irritant. Powerful oxidizer. An explosive. Explosive reaction acetone; alcohols; aromatics (e.g., aniline; benzene; phenol); platinum; manganese dioxide; silver. Incompatible with acetone; catalysts; fibers. When heated to decomposition it emits toxic fumes of SOx. See also PEROXIDES, INORGANIC; PEROXIDES, ORGANIC
RIDADR: 1483
HazardClass: 5.1
PackingGroup: II

Peroxymonosulfuric Acid Analytical Methods

The laboratory scale preparation of Caro's acid involve the combination of chlorosulfuric acid and hydrogen peroxide.
H2O2 + ClSO2OH → H2SO5 + HCl
Large scale production of Caro's acid is usually done on site, due to its instability. According to the patent by Martin, Caro's acid is produced by reacting >85% sulfuric acid and >50% hydrogen peroxide ("Piranha solution").
H2O2 + H2SO4 → H2SO5 + H2O

Peroxymonosulfuric Acid Specification

 Peroxymonosulfuric Acid (CAS NO.7722-86-3) is H2SO5, a liquid at room temperature. In this acid, the S(VI) center adopts its characteristic tetrahedral geometry; the connectivity is indicated by the formula HO-O-S(O)2-OH. It is sometimes confused with H2S2O8, known as peroxydisulfuric acid. The disulfuric acid, which appears to be more widely used as its alkali metal salts, has the structure HO-S(O)2-O-O-S(O)2-OH. As with all strong oxidizing agents, Peroxymonosulfuric Acid should be kept away from organic compounds such as ethers and ketones because of its ability to peroxidize the compound, creating a highly unstable molecule such as acetone peroxide.

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