Sodium sulfide (anhydrous)
A sulfide salt with formula Na2S. The pentahydrate and (particularly) the nonahydrate are also known. In gel form, sodium sulfide is used to soften toenails to assist in trimming (and so relive pain) of ingrowing toenails. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 1313-82-2 | ChEBI ↗ |
| Molecular formula | 2Na.S | ChEBI ↗ |
| Molar mass | 78.047 g/mol | ChEBI ↗ |
| Monoisotopic mass | 77.95161 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:76208 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 78.05 g/mol | PubChem ↗ |
| Exact mass | 77.95160974 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiersodium sulfide (anhydrous)disodium sulfideGRVFOGOEDUUMBP-UHFFFAOYSA-N[Na+].[Na+].[S-2]InChI=1S/2Na.S/q2*+1;-2Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentDisodium sulfide · R01-B-033
| Endpoint | Reported classification |
|---|---|
| Explosives | * |
| Flammable gases （including chemically unstable gases） | * |
| Aerosols | * |
| Oxidizing gases | * |
| Gases under pressure | * |
| Flammable liquids | * |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 78.047 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.