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217247

Sigma-Aldrich

Sodium thiosulfate pentahydrate

ACS reagent, ≥99.5%

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Linear Formula:
Na2S2O3 · 5H2O
CAS Number:
Molecular Weight:
248.18
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent

agency

suitable for EPA 1621
suitable for ISO 25101
suitable for SM 2310
suitable for SM 2320
suitable for SM 4500 - NH3

assay

≥99.5%

form

crystalline powder
crystals
pellets

impurities

≤0.002% N compounds
≤0.005% insolubles

pH

6.0-8.4 (25 °C, 5%)

solubility

water: soluble(lit.)

anion traces

S2-: passes test
SO42- and SO32-: ≤0.1%

cation traces

N: ≤0.002%

SMILES string

O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=S

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

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This Item
S667213479S8503
vibrant-m

217247

Sodium thiosulfate pentahydrate

Essential Grade
vibrant-m

S6672

Sodium thiosulfate pentahydrate

Premium Grade
vibrant-m

13479

Sodium thiosulfate pentahydrate

Essential Grade
vibrant-m

S8503

Sodium thiosulfate pentahydrate

-
Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

200

solubility

water: soluble(lit.)

solubility

H2O: 1 M, clear, colorless

solubility

-

solubility

-

assay

≥99.5%

assay

≥99.5%

assay

99.0-100.5% (USP, dry basis), 99.0-101.0% (EP)

assay

≥99.5%

impurities

≤0.002% N compounds, ≤0.005% insolubles

impurities

≤0.0005% Phosphorus (P), ≤0.005% Insoluble matter

impurities

residual solvents, complies, ≤0.0005% heavy metals (as Pb)

impurities

-

pH

6.0-8.4 (25 °C, 5%)

pH

-

pH

6.0-8.4 (20 °C, 10%)

pH

-

General description

Sodium thiosulfate pentahydrate is a hydrated form of sodium thiosulfate. It is used as a sulfur source for the preparation of various organosulfur compounds.

Application

Applied in a widely useful, thiosulfate-assisted, synthesis of a variety of diamine-CuCN complexes.
Sodium thiosulfate pentahydrate can be used as a sulfur source to synthesize:      
  • Thioester derivatives via one-pot two-step reactions with organic halides and aryl anhydrides.      
  • Sulfur nanoparticles using F. benghalensis leaf extract which acts as a reducing and capping agent.      
  • Unsymmetrical heteroaryl thioethers via multicomponent reaction with heteroaryl chlorides and alcohols.

It can also be used in the fabrication of microencapsulated phase change materials for thermal energy storage applications.

Features and Benefits

Na2S2O3 5H2O is a low toxic and odorless reagent that can be easily used in large-scale operations.

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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Sodium thiosulfate pentahydrate: a redetermination by neutron diffraction.
Lisensky GC and Levy HA.
Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials, 34(6), 1975-1977 (1978)
Fingerprint imaging by scanning electrochemical microscopy.
Zhang M and Girault HH.
Electrochemical Communications, 9(7), 1778-1782 (2007)
Fred B. Stocker et al.
Inorganic chemistry, 38(5), 984-991 (2001-10-24)
A new synthetic procedure developed recently in our laboratories has made possible the synthesis of variety of new complexes of CuCN with diamines. Synthesis was effected by adding the ligand to a solution of CuCN in aqueous sodium thiosulfate. This
Nuclear magnetic resonance in sodium thiosulfate pentahydrate.
Murty CRK and El Saffar ZM.
Acta Crystallographica, 15(6), 536-538 (1962)
Brooke Bair et al.
Journal of drugs in dermatology : JDD, 10(9), 1042-1044 (2011-11-05)
Calcinosis cutis is a term used to describe a group of disorders which result in calcium deposits in the skin. These disorders can be separated based on etiology. Sodium thiosulfate has been used to systemically treat calciphylaxis with little to

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