MilliporeSigma
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1.06516

Supelco

Sodium thiosulfate pentahydrate

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Synonym(s):
Sodium thiosulfate pentahydrate, Antichlor
Empirical Formula (Hill Notation):
Na2O3S2 · 5H2O
CAS Number:
Molecular Weight:
248.18
MDL number:
EC Index Number:
231-867-5

Quality Level

grade

ACS reagent

Agency

reag. ISO
reag. Ph. Eur.

product line

EMSURE®

assay

99.5-101.0% (iodometric)

form

solid

potency

>5000 mg/kg LD50, oral (Rat)

impurities

≤0.005% Insoluble matter

pH

6.0-7.5 (20 °C, 100 g/L in H2O)

mp

48 °C

density

1.74 g/cm3 at 20 °C

bulk density

1000 kg/m3

anion traces

chloride (Cl-): ≤0.008%
sulfate, sulfite (as SO42-): ≤0.1%
sulfide (S2-): passes test

cation traces

Ca: ≤0.002%
Cu: ≤0.0005%
Fe: ≤0.0005%
K: ≤0.001%
Mg: ≤0.001%
N: ≤0.002%
Pb: ≤0.0005%
heavy metals (as Pb): ≤0.001%

storage temp.

2-30°C

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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Related Categories

Linkage

Replaces: SX0815-1; SX0815

Analysis Note

Assay (iodometric): 99.5 - 101.0 %
Identity: passes test
Appearance of solution: passes test
Insoluble matter: ≤ 0.005 %
pH-value (5 %; water, 25 °C): 6.0 - 7.5
pH-value (10 %; water): 6.0 - 7.5
Chloride (Cl): ≤ 0.008 %
Sulfate and sulphite (as SO₄): ≤ 0.1 %
Sulfide (S): passes test
Heavy metals (as Pb): ≤ 0.001 %
Total nitrogen (N): ≤ 0.002 %
Ca (Calcium): ≤ 0.002 %
Cu (Copper): ≤ 0.0005 %
Fe (Iron): ≤ 0.0005 %
K (Potassium): ≤ 0.001 %
Mg (Magnesium): ≤ 0.001 %
Pb (Lead): ≤ 0.0005 %
Corresponds to ACS, ISO, Reag. Ph Eur

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Quality

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