which intermolecular forces are responsible for the dissolution of ethylene glycol?
The Correct Answer and Explanation is :
The dissolution of ethylene glycol (C₂H₆O₂) in water primarily involves hydrogen bonding and dipole-dipole interactions.
Explanation:
- Hydrogen Bonding: Ethylene glycol is a polar molecule, containing two hydroxyl (-OH) groups attached to a two-carbon backbone. These hydroxyl groups are capable of forming hydrogen bonds with water molecules, which is a key factor in the dissolution process. In hydrogen bonding, the partial positive charge on the hydrogen atoms of the -OH group in ethylene glycol can interact with the partial negative charge on the oxygen atoms of water molecules. This attractive force between the -OH groups in ethylene glycol and the water molecules helps the ethylene glycol molecules disperse and dissolve in water.
- Dipole-Dipole Interactions: In addition to hydrogen bonding, ethylene glycol has a permanent dipole moment due to its polar structure. The oxygen atoms in the hydroxyl groups carry partial negative charges, while the carbon atoms bonded to them have partial positive charges. These dipole interactions are important because they facilitate the interaction between the polar ethylene glycol molecules and the polar water molecules. The attraction between the dipoles of ethylene glycol and water helps to overcome the intermolecular forces holding the ethylene glycol molecules together, promoting its dissolution.
- Solvation Process: When ethylene glycol dissolves in water, the water molecules surround the ethylene glycol molecules, stabilizing them through these intermolecular forces. The hydroxyl groups on ethylene glycol interact with water molecules, leading to the formation of a homogeneous solution. The hydrophilic nature of ethylene glycol, mainly due to its ability to form hydrogen bonds with water, makes it highly soluble in water.
In summary, the dissolution of ethylene glycol in water is primarily driven by hydrogen bonding between the hydroxyl groups of ethylene glycol and the water molecules, as well as dipole-dipole interactions between the polar molecules.