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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Reference substances

Reference substances

Currently viewing:
IUPAC name:
Sodium thiosulfate

Inventory

EC number:
231-867-5
EC name:
Sodium thiosulphate
CAS number:
7772-98-7
CAS number:
7772-98-7
Synonyms
Names:
Hyposulphite of soda
Hyposulphite of soda
Sodium hyposulfite
Sodium hyposulfite
Thiosulfuric acid (H2S2O3), disodium salt
Identifier:
IUPAC name
Sodium thiosulfate
Identifier:
IUPAC name
disodium thiosulfate
Identifier:
other: InChl
InChI=1/2Na.H2O3S2.H2O/c;;1-5(2,3)4;/h;;(H2,1,2,3,4);1H2/q2*+1;;/p-2/f2Na.O3S2.H2O/q2m;-2;
Identifier:
other: InChl
InChI=1/2Na.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
Identifier:
other: Molecular formula
Na2O3S2
Identifier:
other: Molecular formula
Na2S2O3
Identifier:
other: SMILES notation
O.[O-]S(=O)(=S)[O-].[Na+].[Na+]
Identifier:
other: SMILES notation
O.[O-]S(=O)(=S)[O-].[Na+].[Na+]
Identifier:
other: SMILES notation
[Na+].[Na+].[O-]S(=O)(=O)[S-]

Molecular and structural information

Molecular formula:
H2O3S2.2Na
Molecular weight:
158
SMILES notation:
[O-]S(=S)(=O)[O-].[Na+].[Na+]
InChl:
InChI=1/2Na.H2O3S2.H2O/c;;1-5(2,3)4;/h;;(H2,1,2,3,4);1H2/q2*+1;;/p-2/f2Na.O3S2.H2O/q2m;-2;
Structural formula:
Chemical structure

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