Sodium diphosphate
An inorganic sodium salt comprised of a diphosphate(4−) anion and four sodium(1+) cations. More commonly known as tetrasodium pyrophosphate, it finds much use in the food industry as an emulsifier and in dental hygiene as a calcium-chelating salt. — ChEBI
Safety documents & references
2 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 | 7722-88-5 | ChEBI ↗ |
| Molecular formula | 4Na.O7P2 | ChEBI ↗ |
| Molar mass | 265.901 g/mol | ChEBI ↗ |
| Monoisotopic mass | 265.871 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:71240 | ChEBI ↗ |
Names & structural identifiers
Copy any identifiersodium diphosphatesodium diphosphateFQENQNTWSFEDLI-UHFFFAOYSA-JO=P([O-])([O-])OP(=O)([O-])[O-].[Na+].[Na+].[Na+].[Na+]InChI=1S/4Na.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4Classification & 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 governmentTetrasodium oxybisphosphonate · R05-C-031-JNIOSH, MOE
| Endpoint | Reported classification |
|---|---|
| Serious eye damage/eye irritation | Category 1 |
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 265.901 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
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