Colorless needle crystals. It turns light yellow in the air or under light. It turns light yellow in
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Colorless needle crystals. It turns light yellow in the air or under light. It turns light yellow in exposed air and light. Soluble in boiling water, soluble in alcohol, ether, ethyl acetate and glacial acetic acid, slightly soluble in water and benzene, insoluble in petroleum ether. The pH value of 0-5% solution is 3.5. Half lethal dose (mice, oral) 2850mg/kg. Stimulant.
| Name | 4-Aminobenzoic acid |
| Synonyms | PABA H-4-Abz-OH The aMino acid 4-carboxyanilin 4-aminobenzoate p-Aminobenzoic acid Folic acid Impurity 4-Aminobenzoic acid Acid 4-aminobenzoico P-amino benzoic acid 4-Aminobenzonic acid Aminobenzoic acid, 4- p-Amino Benzonic Acid Conivaptan hydrochkoride Impurity B |
| CAS | 150-13-0 |
| EINECS | 205-753-0 |
| InChI | InChI=1/C7H7NO2/c8-6-3-1-5(2-4-6)7(9)10/h1-4H,8H2,(H,9,10)/p-1 |
| InChIKey | ALYNCZNDIQEVRV-UHFFFAOYSA-N |
| Molecular Formula | C7H7NO2 |
| Molar Mass | 137.14 |
| Density | 1.374g/mLat 25°C(lit.) |
| Melting Point | 187-189°C(lit.) |
| Boling Point | 251.96°C (rough estimate) |
| Flash Point | 250 °C |
| Water Solubility | 4.7 g/L (20 ºC) |
| Solubility | ethanol: 50 mg/mL. Soluble in hot water, ether, ethyl acetate, ethanol and glacial acetic acid, insoluble in water, benzene, insoluble in petroleum ether. |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Colorless needle crystal |
| Color | White to light yellow |
| Odor | Odorless |
| Merck | 14,423 |
| BRN | 471605 |
| pKa | 2.50, 4.87(at 25℃) |
| PH | 3.5 (5g/l, H2O, 20℃) |
| Storage Condition | 2-8°C |
| Stability | Stable. Incompatible with strong oxidizing agents. Combustible. Sensitive to light and air. May discolour on exposure to light. |
| Sensitive | Air & Light Sensitive |
| Refractive Index | 1.5323 (estimate) |
| MDL | MFCD00007894 |
| Physical and Chemical Properties | character: colorless needle-like crystals. Turn pale yellow in air or light. |
| Use | Used as pharmaceutical and dye intermediates |
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R43 - May cause sensitization by skin contact |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
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