Sodium thiosulfate pentahydrate

Na₂O₃S₂ · 5H₂O

248.18

MFCD00149186

231-867-5

Replaces: SX0815-1; SX0815

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

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

300

ACS reagent

reag. ISO
reag. Ph. Eur.

99.5-101.0% (iodometric)

solid

>5000 mg/kg LD₅₀, oral (Rat)

6.0-7.5 (20 ℃, 100 g/L in H₂O)

48 ℃

1.74 g/cm³ at 20 ℃

1000 kg/m³

chloride (Cl^-): ≤0.008%
sulfate, sulfite (as SO₄^2-): ≤0.1%
sulfide (S^2-): passes test

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%

2-30℃

1S/2Na.H2O3S2.5H2O/c;;1-5(2,3)4;;;;;/h;;(H2,1,2,3,4);5*1H2/q2*+1;;;;;;/p-2

PODWXQQNRWNDGD-UHFFFAOYSA-L

11 - Combustible Solids

WGK 1