1.06516

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: 10102-17-7
• Molecular Weight: 248.18
• MDL number: MFCD00149186
• EC Index Number: 231-867-5

Properties

• grade: ACS reagent
• Quality Level: 300
• 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 SO₄^2-): ≤0.1%; sulfide (S^2-): 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

Description

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

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable