SZSE:002741
Chemical Reagents
Sodium sulfite anhydrous?COA Report
  • CAS No.:7757-83-7
  • Molecular weight:126.04
  • Molecular formula:Na2SO3
  • EC No.:231-821-4
  • HS-No:28321000
Information
Specification category:
Product No. Product name specifications
1.01598.010 Sodium sulfite anhydrous AR500g
1.01598.020 Sodium sulfite anhydrous CP500g
1.01598.030 Sodium sulfite anhydrous AR25kg/drum
1.01598.040 Sodium sulfite anhydrous CP25kg/drum
Characteristic: Appearance and properties: colourless, monoclinic crystal or powder.
Relative density?(water=1): 2.63
Melting point(℃): 150
Concentration: sterling
Solubility: Soluble in water,Dissolved?in ethanol.
Technical indicators:
Item AR CP
Assay(Na2SO3) ≥97.0% ≥95.0%
Clarity of solution Pass3 Pass5
Insoluble matter in water ≤0.005% ≤0.01%
Acidity sulfite(as NaHSO3) Pass Pass
Free alkali(as Na2CO3) ≤0.1% ≤0.3%
Chloride(Cl) ≤0.005% ≤0.02%
Thiosulfate (S2O3) ≤0.01% ≤0.02%
Iron(Fe) ≤0.0005% ≤0.002%
Arsenic(As) ≤0.0001% ≤0.0005%
Heavy metals(as Pb) ≤0.001% ≤0.002%
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