79-09-4
Product Name:
Propionic acid
Formula:
C3H6O2
Synonyms:
Acid C3;Methyl acetic acid;Propanoic acid;Propanyl acid;Propionic acid
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Propionic acid is a colorless liquid with a sharp rancid odor. Produces irritating vapor. (USCG, 1999) |
|---|---|
| Color/Form | Colorless, oily liquid [Note: A solid below 5 degrees F] |
| Odor | Slightly pungent disagreeable, rancid odor |
| Taste | SOUR & MILDLY CHEESE-LIKE |
| Boiling Point | 285.3 °F at 760 mmHg (NTP, 1992) |
| Melting Point | -6.7 °F (NTP, 1992) |
| Flash Point | 130 °F (NTP, 1992) |
| Solubility | greater than or equal to 100 mg/mL at 72 °F (NTP, 1992) |
| Density | 0.995 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Vapor Density | 2.56 (NTP, 1992) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure | 2.9 mmHg at 68 °F ; 10 mmHg at 103.5 °F (NTP, 1992) |
| LogP | 0.33 |
| Henry's Law Constant | Henry's Law constant = 4.45X10-7 atm-cu m/mole at 25 °C |
| Autoignition Temperature | 870 °F (USCG, 1999) |
| Decomposition | When heated to decomposition it emits acrid smoke and irritating fumes. |
| Viscosity | cP: 1.175 at 15 °C; 1.020 at 25 °C; 0.956 at 30 °C; 0.668 at 60 °C; 0.495 at 90 °C |
| Corrosivity | CORROSIVE |
| Heat of Combustion | -1528.3 kJ/mol |
| Heat of Vaporization | 418.7 kJ/kg |
| Surface Tension | 27.21 dynes/cm at 15 °C |
| Ionization Potential | 10.24 eV |
| Odor Threshold | Odor Threshold Low: 0.02 [mmHg] Odor Threshold High: 0.17 [mmHg] Detection odor threshold from AIHA (mean = 0.066 ppm) |
| Refractive Index | Index of refraction: 1.3869 @ 20 °C |
| Dissociation Constants | 4.874 |
| Kovats Retention Index | 702 741 684 711 743 743 683 695 710 732 715 716 716 712 |
| Other Experimental Properties | RATIO OF SPECIFIC HEATS OF VAPOR (GAS): 1.103; LATENT HEAT OF VAPORIZATION: 248 BTU/LB= 138 CAL/G= 5.78X10+5 J/KG |
| Chemical Classes | Other Classes -> Organic Acids |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Corrosion Corrosives GHS05  Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H226:Flammable liquids H314:Skin corrosion/irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
COMPUTED DESCRIPTORS
| Molecular Weight | 74.08 g/mol |
|---|---|
| XLogP3 | 0.3 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 2 |
| Rotatable Bond Count | 1 |
| Exact Mass | 74.036779430 g/mol |
| Monoisotopic Mass | 74.036779430 g/mol |
| Topological Polar Surface Area | 37.3 Ų |
| Heavy Atom Count | 5 |
| Formal Charge | 0 |
| Complexity | 40.2 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Propionic acid is a colorless liquid with a sharp rancid odor. Produces irritating vapor. (USCG, 1999)