CAS 77-92-9: Citric Acid (C6H8O7)
Identity
| CAS Number | 77-92-9 |
| Molecular Formula | C6H8O7 |
| IUPAC Name | 2-hydroxypropane-1,2,3-tricarboxylic acid |
| Molecular Weight | 192.12 g/mol |
| SMILES | OC(=O)CC(O)(CC(=O)O)C(=O)O |
| Synonyms | citrate, 2-hydroxypropane-1,2,3-tricarboxylic acid, E330 |
2D Structure
Physical Properties
| Density | 1.665 g/mL at 25°C |
| Boiling Point | 310.0°C |
| Melting Point | 153.0°C |
| Flash Point | 345.0°C |
| Vapor Pressure | 0.0 kPa at 20°C |
| Refractive Index | nD = 1.494 |
| Dielectric Constant | ε = 19.3 |
Safety & GHS Classification
Irritant
- H319: Causes serious eye irritation
Storage: Store in cool, dry place in tightly sealed containers. Hygroscopic. Keep away from strong bases and oxidizing agents. Low hazard — food-grade chemical.
Material Compatibility Matrix
Plastics
| Material | Rating |
|---|---|
| PTFE | Excellent |
| PVC | Good |
| PE | Good |
| PP | Excellent |
| PEEK | Excellent |
| PVDF | Excellent |
Rubbers
| Material | Rating |
|---|---|
| Viton | Good |
| NBR | Good |
| EPDM | Excellent |
| Silicone | Good |
| FKM | Good |
Metals
| Material | Rating |
|---|---|
| Stainless 316 | Excellent |
| Aluminum | Good |
| Copper | Good |
| Brass | Good |
Applications
- Food preservative and flavoring (E330)
- Pharmaceutical effervescent tablets
- Water softener and chelating agent
- Cosmetics pH adjuster
- Cleaning agent (descaling)
- Biotechnology buffer component
- Bath bomb formulation
External References: PubChem