# Disulfuric acid, sodium salt (1:2)

**CAS:** 13870-29-6  
**PubChem CID:** [9794487](https://pubchem.ncbi.nlm.nih.gov/compound/9794487)  
**Molecular formula:** Na₂O₇S₂  
**Molar mass:** 222.11 g/mol  
**IUPAC:** disodium;sulfonato sulfate  
**SMILES:** `[O-]S(=O)(=O)OS(=O)(=O)[O-].[Na+].[Na+]`  
**InChIKey:** `JXAZAUKOWVKTLO-UHFFFAOYSA-L`  
**InChI:** `InChI=1S/2Na.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| PSA | 140 Ų |
| Hydrogen bond donors | 0 |
| Hydrogen bond acceptors | 7 |
| Rotatable bonds | 0 |
| Heavy atoms | 11 |

## 3D structure

The molecule contains 11 atoms connected by 8 chemical bonds. Interactive 3D model available at: https://molgod.org/molecule/13870-29-6/

## Synonyms

- Disulfuric acid, sodium salt (1:2)
- RefChem:1083875
- DTXCID801028883
- Sodium Disulfate
- disodium;sulfonato sulfate
- disodium disulfate
- Natriumpyrosulfat
- Na2O7S2
- SCHEMBL123783
- NAA87029

## Data sources

- [PubChem CID 9794487](https://pubchem.ncbi.nlm.nih.gov/compound/9794487)
- [Wikidata](https://www.wikidata.org/wiki/Q425193)
- [NIST WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=13870-29-6)
- [ChEMBL](https://www.ebi.ac.uk/chembl/g/#search_results/all/query=13870-29-6)

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*Last updated: 2026-10-17 · Generator: MOL-GOD v3.12.33*