Sodium sulfide
General Product Information
| Article | Sodium sulfide |
| Synonyms | Lodic acid, Potassium salt |
| CAS No. | 1313-82-2 |
| EEG No. | 016-009-00-8 |
| EINECS No. | 215-211-5 |
| IMO | 8 (c) |
| Tariff Code | 28301000 |
| UN No. | 1849 |
| VLG/ADR | Class 8, Packing Group II |
Description
Sodium sulfide is an inorganic compound. It occurs as a yellow to reddish-brown crystalline powder or as an aqueous solution, depending on purity and method of production. The product has a characteristic odor of rotten eggs, caused by the formation of hydrogen sulfide gas (H2S) at contact with moisture or acids. Sodium sulfide is strongly alkaline and acts as a powerful reducing agent, with broad industrial Applications….
Characteristics
- Odor: Odor of rotten eggs.
- Hygroscopic: Yes.
- Color: Yellow to reddish brown.
- Grade: Technical.
- Solubility: Highly soluble in water.
- Shape: powder, flakes or crystals.
Physical & Chemical Properties
| Chemical Structure | Na2S |
| Molar Weight | 78.04 g/mol |
| Melting Point | Approx. 950 °C. |
| Boiling Point | – |
| Density | 1.86 g/cm³ (at 25 °C) |
| Refractive Index | – |
| pH | 12-13 (on 1% solution) |
Interessing Links
- CAS Common Chemistry – Disodium sulfide
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- PubChem – Sodium Sulfide – Chemical information by the National Library of Medicine of the National Center for Biotechnology Information (NIH-NCBI).
- Wikipedia – Sodium sulfide
Applications
Sodium sulfide is applied in various ways, for instance:
1. Learning Industry
For hair removal and pretreatment of skins during the tanning process.
2. Paper Industry
In the kraft process for producing cellulose from wood fibers.
3. Metal Industry
For precipitation of heavy metals from wastewater and as a mordant.
4. Mining
In the flotation process at the extraction of metals such as copper, zinc and lead.
5. Textile Industry
For reducing dyes and decolorizing fabrics.
6. Water Treatment
For heavy metal removal and as an oxygen removal agent.
Because of its high reactivity, sodium sulfide is often used as a basic chemical in syntheses of other sulfur-containing compounds.