| Physical Description |
Pentanoic acid appears as a colorless liquid with a penetrating unpleasant odor. Density 0.94 g / cm3. Freezing point -93.2 °F (-34 °C). Boiling point 365.7 °F (185.4 °C). Flash point 192 °F (88.9 °C). Corrosive to metals and tissue. |
| Color/Form |
Colorless liquid |
| Odor |
UNPLEASANT ODOR, SIMILAR TO BUTYRIC ACID |
| Taste |
Unpleasant flavor, similar to butyric acid |
| Boiling Point |
365 °F at 760 mmHg (NTP, 1992) |
| Melting Point |
-30.1 °F (NTP, 1992) |
| Flash Point |
192 °F (NTP, 1992) |
| Solubility |
10 to 50 mg/mL at 72 °F (NTP, 1992) |
| Density |
0.939 (USCG, 1999) - Less dense than water; will float |
| Vapor Density |
3.52 (NTP, 1992) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure |
1 mmHg at 108 °F ; 40 mmHg at 226.0 °F; 760 mmHg at 363.9 °F (NTP, 1992) |
| LogP |
1.39 |
| Henry's Law Constant |
Henry's Law constant = 4.72X10-7 atm-cu m/mol at 25 °C |
| Autoignition Temperature |
752 °F (USCG, 1999) |
| Decomposition |
Thermal decomposition products include carbon dioxide and carbon monoxide. /Organic acids and related compounds/ |
| Viscosity |
2.30 cP at 20 °C |
| Heat of Combustion |
-2,837.8 kJ/mole |
| Odor Threshold |
Odor Threshold Low: 0.00062 [mmHg] Odor Threshold High: 0.0008 [mmHg] [Hawley] Odor threshold (low) and (100% recognition) from CHEMINFO |
| Refractive Index |
Index of refraction: 1.4086 at 20 degC/D |
| Dissociation Constants |
4.84 (at 25 °C) |
| Kovats Retention Index |
938 894 925 924 883 900 901.9 931 904 880 888 888 |
| Other Experimental Properties |
Undergoes reactions typical of normal monobasic organic acids. |
| Chemical Classes |
Other Classes -> Organic Acids |
