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217247

Sigma-Aldrich

Sodium thiosulfate pentahydrate

ACS reagent, ≥99.5%

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

grade

ACS reagent

Quality Level

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
S85031.0651413479
grade

ACS reagent

grade

-

grade

-

grade

-

assay

≥99.5%

assay

≥99.5%

assay

-

assay

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

form

crystalline powder, crystals, pellets

form

powder

form

crystalline, solid

form

crystalline

impurities

≤0.002% N compounds, ≤0.005% insolubles

impurities

-

impurities

-

impurities

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

pH

6.0-8.4 (25 °C, 5%)

pH

-

pH

6.0-7.5 (20 °C, 100 g/L in H2O)

pH

6.0-8.4 (20 °C, 10%)

solubility

water: soluble(lit.)

solubility

-

solubility

-

solubility

-

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 Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

Enter Lot Number to search for Certificate of Origin (COO).

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