Substance profile
Sulfanilic acid
Sulfanilic acid is orthorhombic plates or monoclinic from water.
01 · Identification
What Sulfanilic acid is
Sulfanilic acid is orthorhombic plates or monoclinic from water. Its molecular formula is C6H7NO3S and its molecular weight is 173.19 g/mol. It melts at 288 °C, is practically insoluble in water.
Under the GHS it carries the signal word Warning.
Other names for Sulfanilic acid
- sulphanilic acid
- 4-aminobenzenesulphonic acid
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
| H317 | May cause an allergic skin reaction. |
Precautionary statements: P261, P264, P272, P280, P302, P305, P313, P332, P333, P337, P338, P352
03 · Physical and chemical properties
Sulfanilic acid properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 288 °C (550.4 °F) | decomposes | HSDB |
| 287.78 °C (550 °F) | decomposes | CAMEO | |
| Density | 1.49 g/cm³ | ICSC | |
| 1.485 g/cm³ | at 25 °C | HSDB | |
| Solubility | Insoluble in ethanol and ether | HSDB | |
| Soluble in fuming hydrochloric acid | HSDB | ||
| Slowly sol in water: about 1% at 20 °C, about 1.45% at 30 °C, about 1.94% at 40 °C | at 20 °C | HSDB | |
| Vapor pressure | 2e-7 mmHg | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Sulfanilic acid
Reactivity
4-AMINOBENZENE SULFONIC ACID is an amino acid. Reacts weakly with both acids and bases.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Sulfanilic acid in the storage compatibility matrix →