Sodium Thiosulfate Pentahydrate

Catalog	ACM10102177
CAS	10102-17-7
Structure
Category	Flocculant
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
Application	Sodium Thiosulfate Pentahydrate serves a multifaceted role across various fields due to its unique chemical properties. Primarily, it is used as an analytical reagent in laboratories for redox reactions and other processes. This versatile compound finds application in photographic processing and gold extraction, as well as in dechlorinating tap water and removing free bromine from solutions. It also helps in checking the pH of bleach solutions using liquid indicators. Moreover, Sodium Thiosulfate Pentahydrate is significant in the tanning of leather, acts as an active component in hand warmers and chemical heating pads, and functions as an anionic surfactant in pharmaceutical dispersions. Its medical applications include use as an antidote to cyanide poisoning, a nephroprotective agent, and an antifungal drug. Additionally, sodium thiosulfate is used as an antioxidant in various pharmaceutical preparations, including ophthalmic, intravenous, and oral forms. This compound's ability to form S-alkylthiosulfonates, or Bunte salts, is integral in the preparation of thioglycolic acid, showcasing its broad utility in both industrial and medical contexts.
Storage	Store at +5 °C to +30 °C
EC Number	231-867-5
Hazard Codes	Xi
HS Code	28323000
LogP	0.18830
MDL Number	MFCD00149186
PSA	149.81
Risk Statements	R36/37/38
RTECS	WE6660000
Safety Statements	S24/25
Stability	Stable. Incompatible with strong acids, iodine, mercury.
Storage Conditions	Store at RT.
WGK Germany	1

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