Peracetic acid

Peracetic acid (also known as peroxyacetic acid, or PAA) is an organic compound with the formula CH3CO3H. This peroxy acid is a colorless liquid with a characteristic acrid odor reminiscent of acetic acid. It can be highly corrosive.

Peracetic acid
Names
Preferred IUPAC name
Ethaneperoxoic acid
Other names
Peroxyacetic acid
Acetic peroxide
Acetyl hydroperoxide
Proxitane
Identifiers
3D model (JSmol)
Abbreviations PAA
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.079
EC Number
  • 201-186-8
KEGG
RTECS number
  • SD8750000
UNII
UN number 3107 3105
  • InChI=1S/C2H4O3/c1-2(3)5-4/h4H,1H3 Y
    Key: KFSLWBXXFJQRDL-UHFFFAOYSA-N Y
  • InChI=1/C2H4O3/c1-2(3)5-4/h4H,1H3
    Key: KFSLWBXXFJQRDL-UHFFFAOYAD
  • CC(=O)OO
Properties
CH3CO3H
Molar mass 76.05 g/mol
Appearance Colorless liquid
Density 1.0375 g/mL
Melting point 0 °C (32 °F; 273 K)
Boiling point 105 °C (221 °F; 378 K) 25 C @ (1.6 kPa)
Acidity (pKa) 8.2
1.3974 (589 nm, 20 °C)
Viscosity 3.280 cP
Pharmacology
QG51AD03 (WHO)
Hazards
GHS labelling:
Danger
H226, H242, H302, H312, H314, H332, H400
P210, P220, P233, P234, P240, P241, P242, P243, P260, P261, P264, P270, P271, P273, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P363, P370+P378, P391, P403+P235, P405, P411, P420, P501
NFPA 704 (fire diamond)
3
2
2
OX
Flash point 40.5 °C (104.9 °F; 313.6 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Peracetic acid is a weaker acid than the parent acetic acid, with a pKa of 8.2.

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