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Anhydrous Sodium sulfate is a white crystalline powder with the chemical formula Na₂SO₄ and a molecular weight of 142.04; it belongs to the class of inorganic sulfate compounds. It has a bitter-salty taste, is odorless and non-toxic, and is hygroscopic, readily absorbing moisture from the air to form sodium sulfate decahydrate. It occurs naturally in salt lakes, salt springs, and mineral veins, and serves as an important basic chemical raw material in fields such as detergent fillers, glass raw materials, paper pulping agents, and medicinal laxatives.
| Item | Specification |
| Melting Point | 884 °C |
| Boiling Point | 1700 °C |
| Density | 2.68 g/mL (25 °C) |
| Flash point | >100°C |
| Vapor Pressure | N/A |
| Refractive index | 1.484 |
| Solubility | 28.1 g/100 mL (water, 25 °C); soluble in glycerol, insoluble in ethanol |
| PH | 5.2–8.0 (50 g/L, 20 °C) |
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