Ethyl ether, or diethyl ether (C4H10O), is a colorless, highly flammable liquid with the structural formula (C2H5)2O. Its formula reflects two ethyl groups (C2H5) attached to an oxygen atom.
Diethyl ether functions as a solvent due to its ability to dissolve both polar and nonpolar substances. Its low boiling point (34.6°C) and high vapor pressure make it volatile. The ether linkage (R-O-R) weakens hydrogen bonding between molecules, reducing surface tension and viscosity.
| Property | Value |
|---|---|
| Molar mass | 74.12 g/mol |
| Boiling point | 34.6°C |
| Melting point | -116.3°C |
| Solubility in water | 6.9 g/100 mL |
Historically, ethyl ether was used as a surgical anesthetic. Today, it serves as a solvent in laboratories, pharmaceuticals, and industrial processes. Its volatility makes it useful in fuel additives and refrigerants.
For example, in labs, diethyl ether dissolves fats, oils, and resins. In manufacturing, it extracts plant compounds like alkaloids. However, its flammability limits its use in high-risk environments.
Another misconception is that all ethers are flammable. While diethyl ether is highly flammable, some ethers, like anisole (methyl phenyl ether), have higher flash points and are safer.
Diethyl ether poses fire and explosion risks. It forms explosive peroxides when exposed to air. Proper storage in airtight containers and use of antioxidants like BHT (butylated hydroxytoluene) are critical.
Inhalation can cause drowsiness and respiratory depression. Proper ventilation and protective equipment are essential when handling ethyl ether.