CAS 10102-17-7 Sodium Thiosulfate Pentahydrate

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Sodium Thiosulfate Pentahydrate

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Catalog Number

ACM10102177

CAS Number

10102-17-7

Product Name

Sodium Thiosulfate Pentahydrate

Structure

Category

Electrolytes

Synonyms

Sodium thiosulfate solution

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.

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

Complexity

82.6

Covalently-Bonded Unit Count

EC Number

231-867-5

Exact Mass

247.96124818

Formal Charge

Hazard Statements

Xi: Irritant;

Heavy Atom Count

Log P

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

Rotatable Bond Count

Safety Description

S24/25

Stability

Stable. Incompatible with strong acids, iodine, mercury.

Storage Conditions

Store at RT.

Topological Polar Surface Area

109 Å²

UNII

HX1032V43M

WGK Germany

Case Study

Preparation of Sodium Thiosulfate Pentahydrate-Based Microcapsule Phase Change Materials

Fu W, et al. Solar Energy Materials and Solar Cells, 2019, 193, 149-156.

Sodium thiosulfate pentahydrate (STP) has high latent heat and high density, which are key to achieving high volumetric energy density. Using STP salt hydrate as the core and polyethyl 2-cyanoacrylate (PECA) as the shell, an embedded phase change material (PCM) was developed through an interfacial polymerization in a water-inoil (W/O) emulsion system.
Preparation of STP@PECA microcapsules
· An aqueous solution containing 0.6 g STP and 0.4 g deionized water was added into oil phase obtained by mixing 8.55 g cyclohexane and 0.45 g emulsifiers composed of span-20 and tween-80 with mass ratio of 2:3.
· Then, the mixture was magnetically stirred for 1 h at 700 rpm in a water bath of 25 °C to create an initial macroemulsion. Subsequently, the resulting macroemulsion was sonicated for 15 min in an ice-water bath using a sonicator.
· After a stable W/O emulsion was formed, 6 ml chloroform solution containing 0.3 g ethyl-2-cyanoacrylate (ECA) was added dropwise to the emulsion under a constant agitation of 200 rpm for several minutes.
· The reaction was carried out at 15 °C for 3 h under the stirring speed of 200 rpm. After the reaction, the obtained microcapsule suspension is centrifuged, washed and dried to obtain the STP@PECA microcapsule product.

Improvement of Thermal Conductivity of Sodium Thiosulfate Pentahydrate Phase Change Material

Rabady R I, et al. Journal of Energy Storage, 2020, 27, 101166.

To overcome the limitations of low thermal conductivity on its application, the thermal conductivity and specific heat of sodium thiosulfate pentahydrate (STP) as a basic phase change material (PCM) can be improved by introducing nanofillers. Among them, carbon nanotubes (CNT) and graphite nanoparticles (GNP) are effective modified fillers. The thermal conductivity of STP composites with the addition of 7% GNP and 7% CNT increased by 155.33% and 249.61%, respectively.
Preparation of STP-based composite PCM
· Pre-melting of pure PCMs, to homogenize the pure PCM. Sodium thiosulfate pentahydrate should be melted until is converted to liquid phase at 50-60 °C.
· The measured amount of nano-fillers is added to liquid Sodium thiosulfate pentahydrate, and then the composites were prepared by shear mixing with a magnetic stirrer for 20 min, followed by ultrasonic shaking for 50 min.
· To the above solution, Carboxymethyl cellulose (CMC) and sodium dodecyl sulfate (SDS) were mixed and thoroughly stirred. The CMC used as a stabilizing or nucleating agent, and SDS used as a surfactant.
· The molten composite is poured gently into a rectangular mold then put it in hydraulic press to take the mold shape without bubbles and allowed to solidify at room temperature.

Crystal Water in Sodium Thiosulfate Pentahydrate Promotes the Synthesis of Heteroaryl Thioether

Ma X, et al. The Journal of Organic Chemistry, 2019, 84(17), 11294-11300.

The crystal water in sodium thiosulfate pentahydrate (Na2S2O3 ·5H2O) can promote the MCR of heteroaryl chlorides, Na2S2O3 ·5H2O and alcohols, thus providing a simple, green and specific one-step synthesis method of asymmetric heteroaryl thioethers. In this method, the crystallization water in Na2S2O3·5H2O is crucial to generate the key thiol intermediate and the by-product NaHSO4. NaHSO4 can catalyze the dehydration substitution reaction between the thiol intermediate and the alcohol, and finally obtain the unsymmetrical heteroaryl thioethers. This method is applicable to a variety of substrates.
General procedure for the synthesis of asymmetric heteroaryl thioethers
· A mixture of 2-pyridyl chloride 1a (56.5 mg, 0.50 mmol), Sodium thiosulfate pentahydrate (248.0 mg, 1.0 mmol, 2.0 equiv.) and benzyl alcohol 2a (54.0 mg, 0.50 mmol, 1.0 equiv.) was sealed in a Schlenk tube (20 mL) under N2, and stirred at 140 °C (oil bath) for 12 h. The reaction was then monitored by TLC and/or GC-MS.
· After completion of the reaction, the reaction mixture was purified by flash column chromatography on silica gel using ethyl acetate and petroleum ether (0~ 1/50) as the eluent, giving 3aa in 86% isolated yield.

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