Pelargonic acid

Pelargonic acid
Names
	Preferred IUPAC name Nonanoic acid
	Other names Nonoic acid; nonylic acid; 1-octanecarboxylic acid; C9:0 (lipid numbers)
Identifiers
CAS Number	112-05-0 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1752351
ChEBI	CHEBI:29019 ;
ChemSpider	7866 ;
ECHA InfoCard	100.003.574
EC Number	203-931-2;
Gmelin Reference	185341
KEGG	C01601 ;
PubChem CID	8158;
UNII	97SEH7577T ;
CompTox Dashboard (EPA)	DTXSID3021641 ;
	InChI InChI=1S/C9H18O2/c1-2-3-4-5-6-7-8-9(10)11/h2-8H2,1H3,(H,10,11) Key: FBUKVWPVBMHYJY-UHFFFAOYSA-N ; InChI=1/C9H18O2/c1-2-3-4-5-6-7-8-9(10)11/h2-8H2,1H3,(H,10,11) Key: FBUKVWPVBMHYJY-UHFFFAOYAF;
	SMILES CCCCCCCCC(=O)O;
Properties
Chemical formula	C9H18O2
Molar mass	158.241 g/mol
Appearance	Clear to yellowish oily liquid
Density	0.900 g/cm3
Melting point	12.5 °C (54.5 °F; 285.6 K)
Boiling point	254 °C (489 °F; 527 K)
Critical point (T, P)	439 °C (712 K), 2.35 MPa
Solubility in water	0.3 g/L
Acidity (pKa)	4.96; 1.055 at 2.06–2.63 K (−271.09 – −270.52 °C; −455.96 – −454.94 °F); 1.53 at −191 °C (−311.8 °F; 82.1 K);
Refractive index (nD)	1.4322
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H412
Precautionary statements	P264, P273, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362, P501
NFPA 704 (fire diamond)	3 1 0
Flash point	114 °C (237 °F; 387 K)
Autoignition; temperature	405 °C (761 °F; 678 K)
Related compounds
Related compounds	Octanoic acid, decanoic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Pelargonic acid, also called nonanoic acid, is an organic compound with structural formula CH₃(CH₂)₇CO₂H. It is a nine-carbon fatty acid. Nonanoic acid is a colorless oily liquid with an unpleasant, rancid odor. It is nearly insoluble in water, but very soluble in organic solvents. The esters and salts of pelargonic acid are called pelargonates or nonanoates.

The acid is named after the pelargonium plant, since oil from its leaves contains esters of the acid.

^ Lide, D. R. (Ed.) (1990). CRC Handbook of Chemistry and Physics (70th Edn.). Boca Raton (FL):CRC Press.

[crc-1] Lide, D. R. (Ed.) (1990). CRC Handbook of Chemistry and Physics (70th Edn.). Boca Raton (FL):CRC Press.

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