The boiling point of acetonitrile (CAS 75-05-8) is approximately 81–82°C at standard atmospheric pressure (1 atm).
Acetonitrile (CAS 75-05-8) is a colorless, volatile liquid with a stable and narrow boiling range, typically considered to be between 81–82°C. Its boiling point is commonly reported as 81.6°C, measured under standard atmospheric pressure (101.3 kPa). As a small-molecule compound, it exhibits a relatively high boiling point, which is attributed to its polarity and dipole-dipole interactions.
What is the function of acetonitrile boiling point?
Acetonitrile's boiling point of 81–82°C enables chemical reactions at moderate to high temperatures without causing immediate solvent evaporation. Its volatility allows for easy separation from samples, while its moderate boiling point ensures it remains liquid at standard high-performance liquid chromatography (HPLC) operating temperatures.
Acetonitrile solvent is frequently employed in distillation processes, where its boiling point characteristics are particularly suited for separating organic components, such as the purification of butadiene or the extraction of fatty acids.
Boiling Point Comparison
| Compound | Boiling Point (°C) | Boiling Point (°F) |
|---|---|---|
| Acetonitrile | 81.6 | 178.88 |
| Ethylene Glycol | 197.3 | 387.14 |
| Dichloromethane | 39.6 | 103.28 |
| Trichloroethylene | 87.2 | 189.0 |
Does the boiling point of acetonitrile affect its storage?
CAS 75-05-8 Acetonitrile's boiling point of 81.6°C renders it highly volatile and flammable. When heated, it decomposes to produce toxic hydrogen cyanide.
Therefore:
- Store in a cool, well-ventilated, fire-resistant area
- Keep away from heat sources, open flames, sparks, and direct sunlight
- Maintain containers tightly closed
- Store separately from oxidizers, acids, and alkalis
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