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Inorganic Salts

Sodium Metabisulphite AR/ACS

RA002404 CAS 7681-57-4 AR/ACS

Identity

Product code
RA002404
CAS number
7681-57-4
Grade
AR/ACS
Purity
97%
Molecular formula
Na2S2O5
Molecular weight
190.10

Classification

Technical Data

Properties

PropertyValueUnit
Physical state at 20 °C Solid —
Colour White crystalline —
Odour Sulphorous —
pH value 4.5 —
Melting point/ Freezing point [°C] 300 °C °C
Density [g/cm3] 1.48 g/cm3 g/cm3
Solubility in water [% weight] 650 g/L g/L
Partition coefficient Log Pow octanol / water at 20°C -3.7 —

These are recorded catalogue property values. Product specification limits, where available, are listed under Specifications.

Specifications

ParameterSpecificationUnit
Appearance White crystalline powder —
Assay Min 97.0 % %
Insoluble matter in water Max 0.005 % %
Chloride (Cl) Max 0.005 % %
Arsenic (As) Max 0.0001 % %
Phosphate (PO4) Max 0.002 % %
Thiosulphate (S2O3) Max 0.05 % %
Heavy metal Max 0.001 % %
Iron (Fe) Max 0.002 % %

6 grades of this substance are listed. Each grade is a separate product with its own specifications, pack sizes and documents.

Packaging

Pack size SKU
25 kg RA002404-PK-25KG
500 g RA002404-PK-500G
50 kg RA002404-PK-50KG
1 kg RA002404-PK-1KG
5 kg RA002404-PK-5KG