13479

Sodium thiosulfate pentahydrate

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

• Linear Formula: Na₂S₂O₃ · 5H₂O
• CAS Number: 10102-17-7
• Molecular Weight: 248.18
• EC Number: 231-867-5
• MDL number: MFCD00149186
• UNSPSC Code: 12352302
• PubChem Substance ID: 329750194
• NACRES: NA.21

Properties

• agency: suitable for EPA 1621; suitable for ISO 25101
• Quality Level: 200
• grade: puriss.
• 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 SO₄^2-): ≤2000 mg/kg; sulfide (S^2-): 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

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable