We are offering sodium sulphitesodium sulphite (na2so3), m.w.:- 126.04 gmol. , cas. No:-7757-83-7specificationphysical appearance a free flowing, white granular powder free from lumps.Appearance of solution a 20 % solution shall be colorless and free from sediment ph of solution 8.5 to 9.5assay as [ na2so3] 96.0 % min.:moisture 0.06 % max.Thiosulphate as na2s2o3 0.03 % max.Alkalinity as na2co3 0.15 % maxalkaline earths ba, ca and sr 0.04 % maxheavy metals as pb 0.002 % max.Packing 25kg 50kg 50lb.