Potassium Metabisulfite
Title: Potassium Metabisulfite
CAS Registry Number: 16731-55-8
CAS Name: Potassium pyrosulfite
Molecular Formula: K2O5S2
Molecular Weight: 222.32
Percent Composition: K 35.17%, O 35.98%, S 28.85%
Line Formula: K2S2O5
Literature References: The article of commerce contains ~95% K2S2O5.
Properties: White crystals or cryst powder; sulfur dioxide odor; acid reaction; liberates SO2 with acids; oxidizes in air to sulfate, more readily in presence of moisture. It may catch fire if much heat develops in powdering it. Freely sol in water; insol in alcohol. Keep dry and well closed.
Use: As antifermentative in breweries and wineries; bleaching straw; preservative for fruits and vegetables.

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