Product description: Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform,solasulfone and Benzaldehyde in medical industry. Molecular Formula : Na2SO3 Molecule Weight : 126.04 CAS NO .: 7757-83-7 Appearance : White Free Flowing Fine Crystal or Powder