The Polar and Non-polar Characteristics in the Structure of Salicylic Acid
Dec 27,2023
Salicylic acid is an organic compound, a colorless, bitter-tasting solid, it is a precursor to and a metabolite of aspirin (acetylsalicylic acid). This article will introduce its polarity.
An organic molecule can have polar and a non-polar regions. Whether the molecule behaves more like a polar or non-polar molecule will depend on which region is more significant.
Salicylic acid has two polar regions, a carboxyl group (giving it it's acidic property) and a hydroxyl group. However, these two groups are attached to a benzene ring which is a non-polar 6 carbon hydrocarbon. This non-polar ring is rather large in comparison to the polar regions of the molecule and so will significantly influence it's properties.
The properties of salicylic acid reflect these polar/non-polar characteristics. The boiling point of salicylic acid (211 °C) is significantly higher than that of non-polar benzene (80 °C), we can attribute this to the stronger intermolecular forces that the polar regions allow salicylic acid to form (H-bonds + dipole-dipole forces).
Therefore, salicylic acid is slightly soluble in water. At room temperature, it can dissolve in water to a limited extent. However, it is more soluble in organic solvents such as ethanol and ether.
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