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Inorganic Salts

Potassium Metabisulphite AR

RA002151 CAS 16731-55-8 AR

Identity

Product code
RA002151
CAS number
16731-55-8
Grade
AR
Purity
96%
Molecular formula
K2S2O5
Molecular weight
222.31

Classification

Technical Data

Properties

PropertyValueUnit
Physical state at 20 °C Solid —
Colour White crystalline —
Odour Odorless —
pH value 3 - 4.5 —
Melting point/ Freezing point [°C] 150 °C °C
Decomposition point [°C] 150 °C °C
Vapour density 2.3 —
Density [g/cm3] 2.34 g/cm3 g/cm3
Solubility in water [% weight] 22.2 g/L g/L

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

Specifications

ParameterSpecificationUnit
Appearance White crystalline powder —
Assay Min 96 % %
Insoluble matter in water Max 0.005 % %
Chloride (Cl) Max 0.005 % %
Copper (Cu) Max 0.005 % %
Lead (Pb) Max 0.005 % %
Iron (Fe) Max 0.005 % %
Zinc (Zn) Max 0.005 % %
Cadmium (Cd) Max 0.005 % %

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

Packaging

Pack size SKU
500 g RA002151-PK-500G