CAS 7772-98-7 Sodium thiosulfate - Materials / Alfa Chemistry

NAVIGATION

Sodium thiosulfate

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Catalog Number

ACM7772987

CAS Number

7772-98-7

Product Name

Sodium thiosulfate

Structure

Category

Electrolytes

Synonyms

Sodium subsulfite

Description

DryPowder; DryPowder, Liquid; DryPowder, PelletsLargeCrystals; GasVapor; Liquid; OtherSolid; PelletsLargeCrystals;COLOURLESS CRYSTALS.

IUPAC Name

Disodium;dioxido-oxo-sulfanylidene-λ6-sulfane

Molecular Weight

158.11

Molecular Formula

Na2O3S2;Na2S2O3;Na2O3S2

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

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.

Storage

Store at +5 °C to +30 °C

Color/Form

POWDER;COLORLESS MONOCLINIC CRYSTALS

Complexity

82.6

Covalently-Bonded Unit Count

EC Number

231-867-5

Exact Mass

157.90842477

Formal Charge

Heavy Atom Count

ICSC Number

1138

Log P

-4.35 (calculated)

MeSH Entry Terms

pentahydrate of sodium thiosulfate;sodium thiosulfate;sodium thiosulfate (USAN);sodium thiosulfate anhydrous;sodium thiosulfate pentahydrate;thiosulfuric acid, disodium salt

Monoisotopic Mass

157.90842477

Refractive Index

INDEX OF REFRACTION: 1.489 ALPHA, 1.508 BETA, 1.536 GAMMA; OPTIC SIGN +

Rotatable Bond Count

RTECS Number

XN6476000

Topological Polar Surface Area

104 Å²

UNII

L0IYT1O31N

Vapor Pressure