| Synonyms | Caustic soda, Sodium Hydroxide, NaOH |
| Appearance | Colourless/white crystalline solid |
| Odor | Odorless |
| Molecular weight | 39.9971 |
| Molar mass | 39.9971 g/mol |
| Melting point | 323 °C |
| Boiling point | 1388 °C |
| Water solubility | 1000 g/L (25 °C), 3370 g/L (100 °C), Exothermic reaction |
| Solubility in ether | Insoluble |
| Refractive index (nD) | 1.3576 |
| Remarks | Hygroscopic |
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