Freshly prepared butyric acid
| IUPAC name
| Other names
|Molar mass||88.11 g/mol|
|Appearance||Colorless oily liquid|
|Density||0.9528 g/cm3 (25 °C)|
|Melting point||−5.1 °C (22.8 °F; 268.0 K)|
|Boiling point||163.75 °C (326.75 °F; 436.90 K)|
|Solubility|| Miscible with glacial acetic acid, diethyl ether, ethanol|
Slightly soluble in CCl4
|Vapor pressure|| 0.112 kPa (20 °C)|
0.74 kPa (50 °C)
9.62 kPa (100 °C)
Std enthalpy of
|Safety data sheet||Sigma-Aldrich|
|Flash point||71–72 °C (160–162 °F; 344–345 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|2,000 mg/kg (oral, rat)|
| Propionic acid|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Butyric acid or butanoic acid, is a carboxylic acid with the formula C3H7COOH.
Butyric acid reacts with bases to give butyrates.
Butyric acid is a colorless liquid, with an unpleasant odor reminiscent of rancid butter or vomit. It is miscible in water and other carboxylic acids.
Butyric acid is sold by various chemical suppliers.
- Make butyrate esters
- Make methyl butyrate
Diluted butyric acid has an unpleasant odor, which may induce nausea in some people. Conc. butanoic acid is harmful and corrosive. Wear proper protection when handling the compound.
Butyric acid should be kept in closed bottles, in a corrosive chemicals cabinet.
Can be neutralized with a base. Burning it is not recommended as it may generate very unpleasant smoke.