MilliporeSigma
All Photos(3)

13479

Sigma-Aldrich

Sodium thiosulfate pentahydrate

puriss., meets analytical specification of Ph. Eur., BP, USP

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

grade

puriss.

Quality Level

Assay

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

form

crystalline

quality

meets analytical specification of Ph. Eur., BP, USP

impurities

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

loss

32-37% loss on drying, 16 h (vacuum)

pH

6.0-8.4 (20 °C, 10%)

anion traces

sulfate, sulfite (as SO42-): ≤2000 mg/kg
sulfide (S2-): in accordance

cation traces

As: ≤3 mg/kg
Ca: ≤50 mg/kg
Fe: ≤10 mg/kg

suitability

complies for appearance of solution

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

Looking for similar products? Visit Product Comparison Guide

Related Categories

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).

More Documents

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service