Sodium thiosulfate
Catalog Number
ACM7772987
CAS
7772-98-7
IUPAC Name
Disodium;dioxido-oxo-sulfanylidene-λ6-sulfane
Synonyms
Sodium subsulfite
Application
Sodium thiosulfate serves a multifaceted purpose across various fields due to its unique chemical properties. In the realms of photography and film, it is primarily employed as a fixing agent because of its ability to dissolve silver halides, a property first identified by Sir John Herschel in 1819. Beyond its photographic applications, sodium thiosulfate is utilized in medicine as an antidote for cyanide poisoning, and in water treatment as a dechlorination agent and fungicide. Its role extends further to the leather and textile industries, where it functions as a mordant and bleaching agent, and acts as a reducing agent in tanning processes. The compound's versatility is highlighted by its use in analytical chemistry for iodine quantification, and it also finds application in the extraction of silver from ore. Sodium thiosulfate's reductive capabilities make it a medium-strength reducing agent, facilitating redox reactions across various industrial processes. Produced from raw materials like soda ash and sulfur, it remains a vital chemical with applications that have stood the test of time, maintaining its significance since the 19th century.
Molecular Weight
158.11
Molecular Formula
Na2O3S2;Na2S2O3;Na2O3S2
Product Information
Description
DryPowder; DryPowder, Liquid; DryPowder, PelletsLargeCrystals; GasVapor; Liquid; OtherSolid; PelletsLargeCrystals;COLOURLESS CRYSTALS.
Canonical SMILES
[O-]S(=O)(=S)[O-].[Na+].[Na+]
InChI
InChI=1S/2Na.H₂O3S2/c;1-5(2,3)4/h;(H2,1,2,3,4)/q2*+1;/p-2
InChI Key
AKHNMLFCWUSKQB-UHFFFAOYSA-L
Boiling Point
100 °C
Melting Point
48 °C
Purity
99%+
Density
1.01 g/mL at 25 °C (lit.)
Solubility
Practically insoluble in alcohol
Appearance
White solid
Storage
Store at +5 °C to +30 °C
Complexity
82.6
Exact Mass
157.90842477
Heavy Atom Count
7
Monoisotopic Mass
157.90842477
Refractive Index
INDEX OF REFRACTION: 1.489 ALPHA, 1.508 BETA, 1.536 GAMMA; OPTIC SIGN +
Rotatable Bond Count
0
Topological Polar Surface Area
104 Ų
Please kindly note that our products and services are for research use only.
Have a question? Get a Free Consultation