Sodium thiosulfate

Sodium thiosulfate
Names
	IUPAC name Sodium thiosulfate
	Other names Sodium hyposulphite; Hyposulphite of soda; Hypo
Identifiers
CAS Number	7772-98-7 ; (pentahydrate): 10102-17-7 ;
3D model (JSmol)	Interactive image; (pentahydrate): Interactive image;
ChEBI	CHEBI:132112 ;
ChEMBL	(pentahydrate): ChEMBL2096650 ;
ChemSpider	22885 ;
ECHA InfoCard	100.028.970
EC Number	231-867-5;
E number	E539 (acidity regulators, ...)
PubChem CID	24477;
RTECS number	XN6476000;
UNII	L0IYT1O31N ; (pentahydrate): HX1032V43M ;
CompTox Dashboard (EPA)	DTXSID9042417 ;
	InChI InChI=1S/2Na.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2+1;/p-2 Key: AKHNMLFCWUSKQB-UHFFFAOYSA-L ; InChI=1/2Na.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2+1;/p-2 Key: AKHNMLFCWUSKQB-NUQVWONBAM; (pentahydrate): InChI=1S/2Na.H2O3S2.5H2O/c;;1-5(2,3)4;;;;;/h;;(H2,1,2,3,4);51H2/q2+1;;;;;;/p-2 Key: PODWXQQNRWNDGD-UHFFFAOYSA-L;
	SMILES [Na+].[Na+].[O-]S([O-])(=O)=S; (pentahydrate): O.O.O.O.O.O=S([O-])([O-])=S.[Na+].[Na+];
Properties
Chemical formula	Na2S2O3
Molar mass	158.11 g/mol (anhydrous) ; 248.18 g/mol (pentahydrate)
Appearance	White crystals
Odor	Odorless
Density	1.667 g/cm3
Melting point	48.3 °C (118.9 °F; 321.4 K) (pentahydrate)
Boiling point	100 °C (212 °F; 373 K) (pentahydrate, - 5H2O decomposition)
Solubility in water	70.1 g/100 mL (20 °C) ; 231 g/100 mL (100 °C)
Solubility	negligible in alcohol
Refractive index (nD)	1.489
Structure
Crystal structure	monoclinic
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
Safety data sheet (SDS)	External MSDS
Related compounds
Other cations	Thiosulfuric acid; Lithium thiosulfate; Potassium thiosulfate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na₂S₂O₃·(H₂O)(x) .Typically it is available as the white or colorless pentahydrate (x = 5), It is a white solid that dissolves well in water. The compound is a reducing agent and a ligand, and these properties underpin its applications.

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