What is hydroxybenzoic acid used for?
4-Hydroxybenzoic acid (4-HBA) is a white crystalline solid that is widely used in organic synthesis. In particular, its esters, called parabens, are used as preservatives in cosmetics and pharmaceuticals.
What is the structure of 3 hydroxybenzoic acid?
3-Hydroxybenzoic acid | C7H6O3 – PubChem.
Is 4-hydroxybenzoic acid acidic?
4-Hydroxybenzoic acid
| Names | |
|---|---|
| Solubility in water | 0.5 g/100 mL |
| Solubility | Soluble in alcohol, ether, acetone Slightly soluble in chloroform Negligibly in CS2 |
| log P | 1.58 |
| Acidity (pKa) | 4.54 |
What is the chemical structure of 4-hydroxybenzoic acid?
4-Hydroxybenzoic acid
| PubChem CID | 135 |
|---|---|
| Structure | Find Similar Structures |
| Chemical Safety | Laboratory Chemical Safety Summary (LCSS) Datasheet |
| Molecular Formula | C7H6O3 |
| Synonyms | 4-HYDROXYBENZOIC ACID 99-96-7 p-Hydroxybenzoic acid 4-Carboxyphenol Benzoic acid, 4-hydroxy- More… |
What is the melting point of 4 hydroxybenzoic acid?
215 – 217 °C
Pricing & Availability
| Physicochemical Information | |
|---|---|
| Density | 1.4041 g/cm3 |
| Ignition temperature | >250 °C |
| Melting Point | 215 – 217 °C |
| pH value | 3.3 (1 g/l, H₂O) |
Why does 4 hydroxybenzoic acid have a high melting point?
The -OH and -COOH groups are pointing opposite each other and are unable to interact with each other within the molecule. Therefore both groups can be used for hydrogen bonds between molecules. This results in more extensive hydrogen bonds and higher melting point for 4-hydroxybenzoic acid.
What is the density of 4 hydroxybenzoic acid?
1.46 g/cm³4-Hydroxybenzoic acid / Density
Does 3 hydroxybenzoic acid have hydrogen bonding?
All isomers of hydroxybenzoic acid can form hydrogen bonds due to the presence of O-H bonds. The position of the -OH group with respect to the -COOH group has an effect on the extensiveness of hydrogen bonds between molecules, and hence their melting points.
Why does 3-hydroxybenzoic acid have a higher boiling point than 4-hydroxybenzoic acid?