| Physical Description |
2-methylpyridine is a colorless liquid with a strong, unpleasant odor. Floats on water. Poisonous vapor is produced. (USCG, 1999) |
| Color/Form |
Colorless liquid |
| Odor |
Strong unpleasant odor |
| Boiling Point |
262 to 264 °F at 760 mmHg (NTP, 1992) |
| Melting Point |
-94 °F (NTP, 1992) |
| Flash Point |
97 °F (NTP, 1992) |
| Solubility |
greater than or equal to 100 mg/mL at 68 °F (NTP, 1992) |
| Density |
0.944 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Vapor Density |
3.21 (NTP, 1992) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure |
8 mmHg at 68 °F ; 40 mmHg at 124.2 °F; 100 mmHg at 160.5 °F (NTP, 1992) |
| LogP |
log Kow = 1.11 |
| Henry's Law Constant |
Henry's Law constant = 9.96X10-6 atm-cu m/mol @ 25 °C |
| Stability/Shelf Life |
2-Methylpyridine is highly stable in aqueous solns ... . |
| Autoignition Temperature |
1000 °F (USCG, 1999) |
| Decomposition |
When heated to decomp, emits toxic fumes of /nitrogen oxides. / |
| pH |
/SRP/: Weak base |
| Ionization Efficiency |
Positive |
| Odor Threshold |
Odor Threshold Low: 0.01 [mmHg] Odor Threshold High: 0.45 [mmHg] [ICSC] Odor threshold low = 0.05 mg/m3 |
| Refractive Index |
Index of refraction: 1.4957 at 20 °C/D |
| Dissociation Constants |
pKa = 5.96 at 20 °C |
| Kovats Retention Index |
792 790 787 802 803 805 787 814 804 799 800 800 804 814 799 799 800 801 802 820 792 792 799 800 825 797.1 799 792.9 797 799 799 770 772 795 798 799 |
| Other Experimental Properties |
/SRP/: Forms salts with acids. |
| Chemical Classes |
Nitrogen Compounds -> Pyridines |
