In glycerin the electrostatic forces between the molecules are stronger.
What are electrostatic forces between molecules?
They are commonly called intermolecular forces and represent the set of attractive and repulsive forces that occur between the molecules of matter due to polarity, that is, the presence and distribution of their electrons.
The strength of intermolecular forces
Organic substances are mostly molecular compounds with predominantly covalent bonds. They have van der Waals intermolecular bonds that are quite weak forces that cause their melting temperatures to be low.
- In the case of propane, the electrostatic forces between its molecules are very weak, which is why it is a gas under normal conditions and has a melting point of -188 °C.
- Acetone is a compound that also has slight intermolecular forces and, although liquid, evaporates easily, its melting point being -95 °C.
- Turpentine is a polyalcohol with a carbon chain with three carbon atoms and three hydroxyl groups with somewhat greater intermolecular forces that allow it to be liquid at room temperature and a melting point of -50 to -60 ºC.
- Glycerin as a mixture of paraffinic, olefinic, cycloparaffinic and aromatic hydrocarbons has a much higher melting temperature (20 °C) than the aforementioned compounds.
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