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16731-55-8

16731-55-8 structural image
Product Name: POTASSIUM METABISULFITE
Formula: K2O5S2
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CHEMICAL AND PHYSICAL PROPERTIES

Physical Description Potassium metabisulfite appears as a white granular or powdery solid with a sharp odor of sulfur dioxide. Decomposes at 150 to 190 °C. Density 2.3 g / cm3. Contact severely irritates skin, eyes, and mucous membranes. Low toxicity. Used as a food preservative and an antioxidant.
Color/Form White crystals or crystalline powder
Odor Sulfur dioxide odor
Melting Point Decomposes at approximately 150 °C
Solubility Freely soluble in water; insoluble in alcohol
Density 2.3 g/cu cm
Stability/Shelf Life When stored at a maximum temperature of 25 °C and a maximum relative humidity of 45%, the shelf life is 6 months.
Decomposition Potassium metabisulfite decomposes at temperatures above 150 °C. In the air, it oxidizes to the sulfate, more readily in the presents of moisture.
Other Experimental Properties Liberates SO2 with acids; oxidizes in air to sulfate, more readily in presence of moisture
Chemical Classes Other Classes -> Sulfites

SAFETY INFORMATION

Signal word Danger
Pictogram(s)

Corrosion
Corrosives
GHS05

Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H318:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P271:Use only outdoors or in a well-ventilated area.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P403+P233:Store in a well-ventilated place. Keep container tightly closed.

COMPUTED DESCRIPTORS

Molecular Weight 222.33 g/mol
Hydrogen Bond Donor Count 0
Hydrogen Bond Acceptor Count 6
Rotatable Bond Count 0
Exact Mass 221.8461284 g/mol
Monoisotopic Mass 221.8461284 g/mol
Topological Polar Surface Area 125 Ų
Heavy Atom Count 9
Formal Charge 0
Complexity 136
Isotope Atom Count 0
Defined Atom Stereocenter Count 0
Undefined Atom Stereocenter Count 0
Defined Bond Stereocenter Count 0
Undefined Bond Stereocenter Count 0
Covalently-Bonded Unit Count 3
Compound Is Canonicalized Yes

PRODUCT INTRODUCTION

description

Potassium metabisulfite appears as a white granular or powdery solid with a sharp odor of sulfur dioxide. Decomposes at 150 to 190 °C. Density 2.3 g / cm3. Contact severely irritates skin, eyes, and mucous membranes. Low toxicity. Used as a food preservative and an antioxidant.

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