Sodium sulfide crystal
Specifications
| Item | Index |
| Sodium sulfide (Na2S), ω/% ≥ | 44 |
| Sodium thiosulfate (Na2S2O3), ω/% ≤ | 0.4 |
| Sodium sulfite (Na2SO3), ω/% ≤ | 0.3 |
| Iron (Fe), ω/ppm ≤ | 5 |
| Water insoluble matter, ω/% ≤ | 0.012 |
| Sodium carbonate, ω/% ≤ | 0.15 |
| Appearance | White crystal |
Packing & Storage
| Packing | Net weight 25.0kg/bag. Inside is double-layer plastic film, hot sealing; outside is woven bag. |
| Storage | 20℃, 2 years. |
| Shipping | Room temperature in China; may vary elsewhere |
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General Information
| Common Names | Sodium sulfide crystal l Disodium sulfide | ||||||
| Structure |  |
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| CAS No. | 1313-82-2 | Boiling Point (℃) | 174ºC | ||||
| Molecular Weight | 78.04 | Melting Point (℃) | 950 °C(lit.) | ||||
| Appearance | Yellow flake caustic | Vapor Specific Gravity | 1.86 g/mL at 25 °C(lit.) | ||||
| HS Code | 28301010 | Flash Point (℃) | N/A | ||||
| Solubility | Autoignition Temperature (℃) | ||||||
| Safety Phrases | S26-S45-S61 | ||
| RIDADR | UN 1849 8/PG 2 | ||
| WGK Germany | 2 | ||
| Packaging Group | II | ||
| Hazard Class | 4.2 | ||
| SYMPTOMS | PREVENTION | FIRST AID | |
| Inhalation | Cough. Sore throat. | Use local exhaust or breathing protection. | Fresh air, rest. |
| Skin | Redness. Burning sensation. Itching. | Protective gloves. | Remove contaminated clothes. Rinse and then wash skin with water and soap. |
| Eyes | Redness. Pain. | Wear safety goggles. | First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. |
| Ingestion | Abdominal pain. Nausea. Vomiting. | Do not eat, drink, or smoke during work. Wash hands before eating. | Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention . |
| Sodium hydroxide method is 20%~30% sodium hydroxide aqueous solution and sulfur powder as raw materials, at the temperature of 115~120 and pressure, by reaction to produce sodium disulfide. Sodium disulfide was not prepared by sodium hydroxide process because of its low conversion rate and low yield. Sodium sulfide process is to prepare sodium disulfide under atmospheric pressure by sodium sulfide and sulfur as raw materials. |
Frequently Asked Questions
Q: What is Sodium sulfide crystal?
A: The chemical formula of sodium sulfide crystal is Na2S·9H2O, and the formula weight is 240.18. It is granular, colorless crystal, white transparent or slightly blue. It is soluble in water and ethanol. The solution is alkaline and corrosive after hydrolysis. When in contact with skin or cutin, it can soften and dissolve and make hair fall off. It is soluble in crystal water at 50°C. It turns yellow when exposed to light, and can be oxidized to sodium thiosulfate in air. Sodium polysulfide is generated after putting sulfur in aqueous solution.
Q: What is Sodium sulfide crystal used for?
A: Sodium sulfide crystal is used in the preparation of sulfur dyes, leather depilatory agents, and as a reducing agent in the organic chemical industry. The cooking agent in the paper industry is also widely used in the pigment, rubber and other industries. Calcined with sodium sulfate mixed with carbon, sodium sulfate can be reduced to form sodium sulfide. It was found that the oxidation product of crystalline sodium sulfide should be a mixture of elemental sulfur, sodium polysulfide, sodium sulfite, and sodium sulfate through experiments. In the experiment, the content of partial oxidation products is relatively small, so it is easy to be ignored by everyone.
Q: Is Sodium sulfide toxic?
A: Sodium sulfide is corrosive and toxic, and it is easily oxidized in the air to form sodium thiosulfate. After sodium sulfide deliquesces in the air, it will be carbonized and deteriorated, continuously releasing hydrogen sulfide gas, which will also have a toxic effect on the human body. Sodium sulfide is also known as stinky alkali, stinky soda, yellow alkali, and alkali sulfide. Sodium sulfide is an inorganic compound, and pure sodium sulfide is a colorless crystalline powder. Strong hygroscopicity, easily soluble in water. The aqueous solution has a strong alkaline reaction and will cause burns when it touches the skin and hair.