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Description
Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is an inorganic compound that is typically available as the pentahydrate, Na2S2O3·5H₂O. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water. It is also called sodium hyposulfite or “hypo”.It is on the World Health Organization’s List of Essential Medicines, the most important medications needed in a basic health system.
Synonyms
Sodium thiosulfate solution
IUPAC Name
Disodium;dioxido-oxo-sulfanylidene-λ6-sulfane;pentahydrate
Molecular Weight
248.19
Molecular Formula
H10Na2O8S2
Canonical SMILES
O.O.O.O.O.[O-]S(=O)(=S)[O-].[Na+].[Na+]
InChI
InChI=1S/2Na.H₂O3S2.5H₂O/c;1-5(2,3)4;/h;(H2,1,2,3,4);5*1H2/q2*+1;/p-2
InChI Key
PODWXQQNRWNDGD-UHFFFAOYSA-L
Boiling Point
100 °C
Melting Point
48.5 °C
Purity
99%+
Density
1.01 g/mL at 25 °C (lit.)
Appearance
White tranparent solid
Storage
Store at +5 °C to +30 °C
Complexity
82.6
Covalently-Bonded Unit Count
8
EC Number
231-867-5
Exact Mass
247.96124818
Formal Charge
0
H-Bond Acceptor
9
H-Bond Donor
5
Heavy Atom Count
12
LogP
0.18830
MDL Number
MFCD00149186
MeSH Entry Terms
pentahydrate of sodium thiosulfate;sodium thiosulfate;sodium thiosulfate (USAN);sodium thiosulfate anhydrous;sodium thiosulfate pentahydrate;thiosulfuric acid, disodium salt
Monoisotopic Mass
247.96124818
Odor
Odorless
Physical State
Colorless to white powder or chunks
Rotatable Bond Count
0
Stability
Stable. Incompatible with strong acids, iodine, mercury.
Topological Polar Surface Area
109 Ų
UNII
HX1032V43M
