What is the key difference in the IR spectra of acetylsalicylic acid and salicylic acid?
What is the key difference in the IR spectra of acetylsalicylic acid and salicylic acid?
A key difference is acetylsalicylic acid shows two strong peaks in the carbonyl (C=O) stretching region (1650 – 1800 cm-1), because it has two different carbonyl groups — while salicylic acid has only one.
How do you use IR spectra to identify compounds?
It works by shining infrared light through the organic compound we want to identify; some of the frequencies are absorbed by the compound, and if we monitor the light that makes it through, the exact frequencies of the absorptions can be used to identify specific groups of atoms within the molecules.
What functional group is present in salicylic acid?
Structure of Salicylic Acid It contains a hydroxyl group (–OH group) attached at the ortho position with respect to the carboxylic acid functional group(–COOH group) present on the benzene ring. The molecular weight (or molar mass) of Salicylic Acid is 138.12 g/mol.
What is the IR spectra of aspirin?
The NMR spectrum of synthesized aspirin is located at the bottom of Figure 7. The peak near 10.5 ppm represents the hydrogen from the carboxylic acid functional group, which can be confirmed by the IR spectrum of aspirin (O-H carboxylic acid band at 3000–2500 cm-1).
What does IR spectroscopy measure in a molecule?
IR spectroscopy is the measurement of the wavelength and intensity of the absorption of infrared light by a sample (Putzig et al., 1994).
What are the 3 distinct functional groups of salicylic acid?
Explanation: Salicylic acid (2-hydroxybenzoic acid) is formed of a benzene ring to which 2 adjacent groups, carboxylic group and hydroxy group, are attached. We don’t normally consider benzene to be a functional group, so that’s why the hydroxyl and carboxylic are the ones that count.
What is the IR spectrum of salicylic acid?
Looking again at the starting materials of the aspirin synthesis reaction, acetic acid and salicylic acid, each compound has one peak in the 1650 to 1850 cm -1 range on their IR spectra. Acetic acid has a peak at 1704.69 cm -1 and salicylic acid has a peak at 1652.36 cm -1.
Is salicylic acid a weak acid?
Salicylic acid is a weak beta hydroxy acid. It is used in concentrations of about 17 percent to treat warts, because the outside of a wart is often very rough. Salicylic acid’s exfoliating properties slough away the outer layers of the wart and act to try and kill accessible parts of the wart.
How does salicylic acid treat scalp psoriasis?
Salicylic Acid. Salicylic acid is classified as a keratolytic, or peeling agent, and works by causing the outer layer of skin to shed. It is a common and effective treatment for a wide variety of skin problems. As a psoriasis treatment, it acts as a scale lifter, helping to soften and remove psoriasis scales.
Is salicylic acid polar or nonpolar?
For this, you can refer back to some basic chemistry rules for solutes and solvents: that polar dissolves polar and nonpolar dissolves nonpolar. Ethanol is a moderately polar solvent (due to the polarized -OH group). Salicylic acid is also slightly polar, due to it’s carboxy group and the pi-cloud of the benzene ring.
