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72049

Sigma-Aldrich

Sodium thiosulfate

purum p.a., anhydrous, ≥98.0% (RT)

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About This Item

Linear Formula:
Na2S2O3
CAS Number:
7772-98-7
Molecular Weight:
158.11
EC Number:
231-867-5
MDL number:
MFCD00003499
UNSPSC Code:
12352302
PubChem Substance ID:
329763718
NACRES:
NA.21
Assay:
≥98.0% (RT)
form:
crystals
Pricing and availability is not currently available.

Quality Level

200

grade

purum p.a.

Assay

≥98.0% (RT)

form

crystals

pH

6.0-8.5 (25 °C, 50 mg/mL in H2O)

anion traces

sulfide (S2-): ≤50 mg/kg

cation traces

Ca: ≤50 mg/kg
Cd: ≤50 mg/kg
Co: ≤50 mg/kg
Cu: ≤50 mg/kg
Fe: ≤50 mg/kg
K: ≤500 mg/kg
Ni: ≤50 mg/kg
Pb: ≤50 mg/kg
Zn: ≤50 mg/kg

SMILES string

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

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

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General description

The product is anhydrous sodium thiosulfate (Na2S2O3). It can be obtained from Na2S2O3.10H2O by heating above 100°C. It can be synthesized from sodium sulfate.[1]

Application

Sodium thiosulfate (Na2S2O3) may be used in the following studies:
  • Industrial synthesis of methylene blue.[2]
  • Quantitative estimation of elemental iodine by titrimetry.[3]
  • Detection of trace levels of cysteine by employing triangular silver nanoplates (TAg-NPs).[4]

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
BCCL6250
BCCM3722
BCCM4571
BCCL5139
BCCL1056

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Xin Yan Hou et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 125, 285-289 (2014-02-22)
In this study, triangular silver nanoplates (TAg-NPs) were used to detect trace Cysteine concentration in the presence of sodium thiosulfate (Na2S2O3). Study showed that the TAg-NPs could be gently etched by Cysteine with the concentration of 1.0×10(-7) mol L(-1) through
Eagleson M.
Concise Encyclopedia Chemistry, 648-648 (1994)
Eagleson M.
Concise Encyclopedia Chemistry, 1001-1001 (1994)
Eagleson M.
Concise Encyclopedia Chemistry, 542-542 (1994)
William C Kwan et al.
The Journal of comparative neurology, 527(3), 558-576 (2018-01-03)
The primate visual brain possesses a myriad of pathways, whereby visual information originating at the retina is transmitted to multiple subcortical areas in parallel, before being relayed onto the visual cortex. The dominant retinogeniculostriate pathway has been an area of
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