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
• UNSPSC Code: 12352302
• EC Index Number: 231-867-5
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 300
• agency: reag. ISO; reag. Ph. Eur.; suitable for SM 2310; suitable for SM 2320; suitable for SM 4500 - NH3
• 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

Application

• Synthesis of Aryl Amides from Acyl-Bunte Salts and Aryl Azides: Details the application of sodium thiosulfate pentahydrate in synthetic organic chemistry, specifically in the synthesis of aryl amides, illustrating its utility in facilitating complex chemical reactions (Chen et al., 2023).

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: 13 - Non Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable