Product Description of Sodium Hydroxide CAS#1310-73-2
Sodium hydroxide, commonly known as caustic soda, has the chemical formula NaOH. It is a powerful base that typically appears as white flakes or granules. It is highly soluble in water, forming an alkaline solution, and is also soluble in methanol and ethanol. Sodium hydroxide is deliquescent, meaning it readily absorbs moisture from the air, as well as acidic gases such as carbon dioxide. As one of the most widely used chemical substances, it plays a significant role in numerous industrial processes. It is extensively employed in the production of paper and pulp manufacturing, textiles, soap, and detergent, and is also frequently found in household alkaline drain-cleaning products.
Chemical Properties
| Melting point | 681 °C(lit.) |
| Boiling point | 1390°C |
| density | 1.515 g/mL at 20 °C |
| vapor density | <1 (vs air) |
| vapor pressure | 1 mm Hg ( 745 °C) |
| refractive index | 1,473-1,475 |
| Fp | 176-178°C |
| storage temp. | room temp |
| solubility | H2O: 1 M at 20 °C, clear, colorless |
| form | beads |
| Specific Gravity | 2.13 |
| color | White |
| Odor | Odorless |
| PH Range | 13 - 14 |
| PH | 10.98(1 mM solution);11.95(10 mM solution);12.88(100 mM solution); |
| Water Solubility | SOLUBLE |
| Sensitive | Air Sensitive & Hygroscopic |
| Decomposition | 176-178 ºC |
| λmax | λ: 260 nm Amax: 0.015 λ: 280 nm Amax: 0.01 |
| Merck | 14,8627 |
| Exposure limits | TLV-TWA air 2 mg/m3 (OSHA); ceiling 2 mg/m3 (ACGIH) and 2 mg/m3/15 min (NIOSH). |
| Dielectric constant | 57.5（25℃） |
| Stability: | hygroscopic |
| CAS DataBase Reference | 1310-73-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Sodium hydroxide(1310-73-2) |
| EPA Substance Registry System | Sodium hydroxide (1310-73-2) |
Safety Information
| Hazard Codes | C,Xi |
| Risk Statements | 36/38-35-34 |
| Safety Statements | 26-45-37/39-24/25-36/37/39 |
| RIDADR | UN 1824 8/PG 2 |
| WGK Germany | 1 |
| RTECS | TT2975000 |
| F | 8 |
| TSCA | Yes |
| HS Code | 2815 11 00 |
| HazardClass | 8 |
| PackingGroup | II |
| Hazardous Substances Data | 1310-73-2(Hazardous Substances Data) |
| Toxicity | LD orally in rabbits: 500 mg/kg (10% soln) (Fazekas) |
| IDLA | 10 mg/m3 |
Product Application
Sodium hydroxide has a wide range of applications. In laboratory settings, it is commonly used as a chemical reagent; due to its strong moisture-absorbing properties, it also serves as an alkaline drying agent. Caustic soda plays a significant role in the national economy and is indispensable across many industrial sectors. Its largest consumption occurs in the chemical and pharmaceutical manufacturing, followed by papermaking, aluminum and tungsten smelting, the production of rayon and synthetic fiber, and soap manufacturing.
Furthermore, large quantities of sodium hydroxide are utilized in the production of dyes, plastics, pharmaceuticals, and organic intermediates. It is also employed in scrap rubber recycling, the production of metallic sodium, water electrolysis, and the manufacture of inorganic salts such as borax, chromium salts, manganates, and phosphates. Given its strong alkalinity, sodium hydroxide has the potential to cause water pollution; therefore, appropriate preventive measures should be taken to protect vegetation and aquatic life.
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